Update libcxx/libcxxabi to llvm 16.0.6 (#20094)

This only include readme changes and the version number change in
`libcxx/include/__config`. This is not a terribly meaningful update, but
I'm trying to update libunwind based on llvm 16.0.6 and it would be
simpler if all libraries are based on the same version.

Fixed tag -> branch in `readme.txt`s given that we don't use tags in
https://github.com/emscripten-core/llvm-project.

Author: aheejin

system/lib/libcxx/include/__config

@@ -38,7 +38,7 @@
 // _LIBCPP_VERSION represents the version of libc++, which matches the version of LLVM.
 // Given a LLVM release LLVM XX.YY.ZZ (e.g. LLVM 16.0.1 == 16.00.01), _LIBCPP_VERSION is
 // defined to XXYYZZ.
-#  define _LIBCPP_VERSION 160004
+#  define _LIBCPP_VERSION 160006
 
 #  define _LIBCPP_CONCAT_IMPL(_X, _Y) _X##_Y
 #  define _LIBCPP_CONCAT(_X, _Y) _LIBCPP_CONCAT_IMPL(_X, _Y)

system/lib/libcxx/readme.txt

@@ -1,14 +1,14 @@
 llvm's libcxx
 -------------
 
-These files are from the llvm-project based on release 16.0.4.
+These files are from the llvm-project based on release 16.0.6.
 
 We maintain a local fork of llvm-project that contains any emscripten
 specific patches:
 
   https://github.com/emscripten-core/llvm-project
 
-The current patch is based on the emscripten-libs-16 tag.
+The current patch is based on the emscripten-libs-16 branch.
 
 Update Instructions
 -------------------
@@ -20,4 +20,4 @@ Modifications
 
 For a list of changes from upstream see the libcxx files that are part of:
 
-https://github.com/llvm/llvm-project/compare/llvmorg-16.0.4...emscripten-core:emscripten-libs-16
+https://github.com/llvm/llvm-project/compare/llvmorg-16.0.6...emscripten-core:emscripten-libs-16

system/lib/libcxxabi/readme.txt

@@ -1,23 +1,23 @@
 llvm's libcxxabi
 ----------------
 
-These files are from the llvm-project based on release 16.0.4.
+These files are from the llvm-project based on release 16.0.6.
 
 We maintain a local fork of llvm-project that contains any emscripten
 specific patches:
 
   https://github.com/emscripten-core/llvm-project
 
-The current patch is based on the emscripten-libs-16.0.0 tag.
+The current patch is based on the emscripten-libs-16 branch.
 
 Update Instructions
 -------------------
 
-Run `system/lib/update_libcxxabi.py path/to/llvm-root`
+Run `system/lib/update_libcxxabi.py path/to/llvm-project`
 
 Modifications
 -------------
 
 For a list of changes from upstream see the libcxxabi files that are part of:
 
-https://github.com/llvm/llvm-project/compare/llvmorg-16.0.4...emscripten-core:emscripten-libs-16
+https://github.com/llvm/llvm-project/compare/llvmorg-16.0.6...emscripten-core:emscripten-libs-16

test/other/metadce/test_metadce_files_wasmfs.funcs

@@ -32,8 +32,8 @@ $__unlockfile
 $__wasi_fd_close
 $__wasi_fd_write
 $__wasm_call_ctors
-$decltype\28auto\29\20std::__2::__variant_detail::__visitation::__base::__dispatcher<0ul>::__dispatch\5babi:v160004\5d<std::__2::__variant_detail::__dtor<std::__2::__variant_detail::__traits<std::__2::vector<wasmfs::Directory::Entry\2c\20std::__2::allocator<wasmfs::Directory::Entry>>\2c\20int>\2c\20\28std::__2::__variant_detail::_Trait\291>::__destroy\5babi:v160004\5d\28\29::'lambda'\28auto&\29&&\2c\20std::__2::__variant_detail::__base<\28std::__2::__variant_detail::_Trait\291\2c\20std::__2::vector<wasmfs::Directory::Entry\2c\20std::__2::allocator<wasmfs::Directory::Entry>>\2c\20int>&>\28auto\2c\20std::__2::__variant_detail::__base<\28std::__2::__variant_detail::_Trait\291\2c\20std::__2::vector<wasmfs::Directory::Entry\2c\20std::__2::allocator<wasmfs::Directory::Entry>>\2c\20int>&\29
-$decltype\28auto\29\20std::__2::__variant_detail::__visitation::__base::__dispatcher<1ul>::__dispatch\5babi:v160004\5d<std::__2::__variant_detail::__dtor<std::__2::__variant_detail::__traits<long\2c\20std::__2::shared_ptr<wasmfs::File>>\2c\20\28std::__2::__variant_detail::_Trait\291>::__destroy\5babi:v160004\5d\28\29::'lambda'\28auto&\29&&\2c\20std::__2::__variant_detail::__base<\28std::__2::__variant_detail::_Trait\291\2c\20long\2c\20std::__2::shared_ptr<wasmfs::File>>&>\28auto\2c\20std::__2::__variant_detail::__base<\28std::__2::__variant_detail::_Trait\291\2c\20long\2c\20std::__2::shared_ptr<wasmfs::File>>&\29
+$decltype\28auto\29\20std::__2::__variant_detail::__visitation::__base::__dispatcher<0ul>::__dispatch\5babi:v160006\5d<std::__2::__variant_detail::__dtor<std::__2::__variant_detail::__traits<std::__2::vector<wasmfs::Directory::Entry\2c\20std::__2::allocator<wasmfs::Directory::Entry>>\2c\20int>\2c\20\28std::__2::__variant_detail::_Trait\291>::__destroy\5babi:v160006\5d\28\29::'lambda'\28auto&\29&&\2c\20std::__2::__variant_detail::__base<\28std::__2::__variant_detail::_Trait\291\2c\20std::__2::vector<wasmfs::Directory::Entry\2c\20std::__2::allocator<wasmfs::Directory::Entry>>\2c\20int>&>\28auto\2c\20std::__2::__variant_detail::__base<\28std::__2::__variant_detail::_Trait\291\2c\20std::__2::vector<wasmfs::Directory::Entry\2c\20std::__2::allocator<wasmfs::Directory::Entry>>\2c\20int>&\29
+$decltype\28auto\29\20std::__2::__variant_detail::__visitation::__base::__dispatcher<1ul>::__dispatch\5babi:v160006\5d<std::__2::__variant_detail::__dtor<std::__2::__variant_detail::__traits<long\2c\20std::__2::shared_ptr<wasmfs::File>>\2c\20\28std::__2::__variant_detail::_Trait\291>::__destroy\5babi:v160006\5d\28\29::'lambda'\28auto&\29&&\2c\20std::__2::__variant_detail::__base<\28std::__2::__variant_detail::_Trait\291\2c\20long\2c\20std::__2::shared_ptr<wasmfs::File>>&>\28auto\2c\20std::__2::__variant_detail::__base<\28std::__2::__variant_detail::_Trait\291\2c\20long\2c\20std::__2::shared_ptr<wasmfs::File>>&\29
 $dlmalloc
 $dummy
 $fflush
@@ -45,7 +45,7 @@ $operator\20delete\28void*\29
 $operator\20new\28unsigned\20long\29
 $pthread_mutex_init
 $sbrk
-$std::__2::__allocation_result<std::__2::allocator_traits<std::__2::allocator<char>>::pointer>\20std::__2::__allocate_at_least\5babi:v160004\5d<std::__2::allocator<char>>\28std::__2::allocator<char>&\2c\20unsigned\20long\29
+$std::__2::__allocation_result<std::__2::allocator_traits<std::__2::allocator<char>>::pointer>\20std::__2::__allocate_at_least\5babi:v160006\5d<std::__2::allocator<char>>\28std::__2::allocator<char>&\2c\20unsigned\20long\29
 $std::__2::__shared_ptr_emplace<wasmfs::MemoryDataFile\2c\20std::__2::allocator<wasmfs::MemoryDataFile>>::~__shared_ptr_emplace\28\29
 $std::__2::__shared_ptr_emplace<wasmfs::MemoryDataFile\2c\20std::__2::allocator<wasmfs::MemoryDataFile>>::~__shared_ptr_emplace\28\29.1
 $std::__2::__shared_ptr_emplace<wasmfs::MemoryDirectory\2c\20std::__2::allocator<wasmfs::MemoryDirectory>>::__on_zero_shared\28\29
@@ -75,14 +75,14 @@ $std::__2::basic_string<char\2c\20std::__2::char_traits<char>\2c\20std::__2::all
 $std::__2::basic_string<char\2c\20std::__2::char_traits<char>\2c\20std::__2::allocator<char>>&\20std::__2::basic_string<char\2c\20std::__2::char_traits<char>\2c\20std::__2::allocator<char>>::__assign_no_alias<true>\28char\20const*\2c\20unsigned\20long\29
 $std::__2::basic_string<char\2c\20std::__2::char_traits<char>\2c\20std::__2::allocator<char>>::__grow_by_and_replace\28unsigned\20long\2c\20unsigned\20long\2c\20unsigned\20long\2c\20unsigned\20long\2c\20unsigned\20long\2c\20unsigned\20long\2c\20char\20const*\29
 $std::__2::basic_string<char\2c\20std::__2::char_traits<char>\2c\20std::__2::allocator<char>>::__init_copy_ctor_external\28char\20const*\2c\20unsigned\20long\29
-$std::__2::basic_string<char\2c\20std::__2::char_traits<char>\2c\20std::__2::allocator<char>>::__invalidate_iterators_past\5babi:v160004\5d\28unsigned\20long\29
-$std::__2::basic_string<char\2c\20std::__2::char_traits<char>\2c\20std::__2::allocator<char>>::__throw_length_error\5babi:v160004\5d\28\29\20const
+$std::__2::basic_string<char\2c\20std::__2::char_traits<char>\2c\20std::__2::allocator<char>>::__invalidate_iterators_past\5babi:v160006\5d\28unsigned\20long\29
+$std::__2::basic_string<char\2c\20std::__2::char_traits<char>\2c\20std::__2::allocator<char>>::__throw_length_error\5babi:v160006\5d\28\29\20const
 $std::__2::char_traits<char>::copy\28char*\2c\20char\20const*\2c\20unsigned\20long\29
-$std::__2::shared_ptr<wasmfs::SpecialFiles::\28anonymous\20namespace\29::RandomFile>\20std::__2::make_shared\5babi:v160004\5d<wasmfs::SpecialFiles::\28anonymous\20namespace\29::RandomFile\2c\20void>\28\29
+$std::__2::shared_ptr<wasmfs::SpecialFiles::\28anonymous\20namespace\29::RandomFile>\20std::__2::make_shared\5babi:v160006\5d<wasmfs::SpecialFiles::\28anonymous\20namespace\29::RandomFile\2c\20void>\28\29
 $std::__2::vector<unsigned\20char\2c\20std::__2::allocator<unsigned\20char>>::__append\28unsigned\20long\29
-$std::__2::vector<wasmfs::MemoryDirectory::ChildEntry\2c\20std::__2::allocator<wasmfs::MemoryDirectory::ChildEntry>>::erase\5babi:v160004\5d\28std::__2::__wrap_iter<wasmfs::MemoryDirectory::ChildEntry\20const*>\29
+$std::__2::vector<wasmfs::MemoryDirectory::ChildEntry\2c\20std::__2::allocator<wasmfs::MemoryDirectory::ChildEntry>>::erase\5babi:v160006\5d\28std::__2::__wrap_iter<wasmfs::MemoryDirectory::ChildEntry\20const*>\29
 $strlen
-$void\20std::__2::__libcpp_operator_delete\5babi:v160004\5d<void*>\28void*\29
+$void\20std::__2::__libcpp_operator_delete\5babi:v160006\5d<void*>\28void*\29
 $void\20std::__2::vector<std::__2::shared_ptr<wasmfs::OpenFileState>\2c\20std::__2::allocator<std::__2::shared_ptr<wasmfs::OpenFileState>>>::__emplace_back_slow_path<>\28\29
 $wasmfs::DataFile::Handle::flush\28\29
 $wasmfs::DataFile::Handle::write\28unsigned\20char\20const*\2c\20unsigned\20long\2c\20long\20long\29