Update LLVM version from 15 to 16

Original commit:
KhronosGroup/SPIRV-LLVM-Translator@7aa1fd2

Author: svenvh

README.md

@@ -5,8 +5,6 @@ Intel LLVM-based projects:
 
 - [oneAPI DPC++ compiler](#oneapi-dpc-compiler)
 - [Late-outline OpenMP and OpenMP Offload](#late-outline-openmp-and-openmp-offload)
-sudo apt-get install llvm-16-dev llvm-16-tools clang-16 libclang-16-dev
-`-DLLVM_EXTERNAL_LIT="/usr/lib/llvm-16/build/utils/lit/lit.py"` is
 
 ## oneAPI DPC++ compiler
 

llvm-spirv/README.md

@@ -29,7 +29,7 @@ The translator can be built with the latest(nightly) package of LLVM. For Ubuntu
 wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
 sudo add-apt-repository "deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial main"
 sudo apt-get update
-sudo apt-get install llvm-15-dev llvm-15-tools clang-15 libclang-15-dev
+sudo apt-get install llvm-16-dev llvm-16-tools clang-16 libclang-16-dev
 ```
 The installed version of LLVM will be used by default for out-of-tree build of the translator.
 ```
@@ -153,7 +153,7 @@ make test
 ```
 This requires that the `-DLLVM_SPIRV_INCLUDE_TESTS=ON` argument is
 passed to CMake during the build step. Additionally,
-`-DLLVM_EXTERNAL_LIT="/usr/lib/llvm-15/build/utils/lit/lit.py"` is
+`-DLLVM_EXTERNAL_LIT="/usr/lib/llvm-16/build/utils/lit/lit.py"` is
 needed when building with a pre-installed version of LLVM.
 
 The translator test suite can be disabled by passing