[ifs] Added missing DT_STRSZ to the .dynamic section

This patch adds DT_STRSZ into the dynamic section, which was absent
previously. This was a bug and caused failures in other tools.

Differential Revision: https://reviews.llvm.org/D117058

Author: zeroomega

llvm/lib/InterfaceStub/ELFObjHandler.cpp

@@ -226,6 +226,7 @@ template <class ELFT> class ELFStubBuilder {
     // Poplulate dynamic table.
     size_t DynSymIndex = DynTab.Content.addAddr(DT_SYMTAB, 0);
     size_t DynStrIndex = DynTab.Content.addAddr(DT_STRTAB, 0);
+    DynTab.Content.addValue(DT_STRSZ, DynSym.Size);
     for (const std::string &Lib : Stub.NeededLibs)
       DynTab.Content.addValue(DT_NEEDED, DynStr.Content.getOffset(Lib));
     if (Stub.SoName)

llvm/test/tools/llvm-ifs/write-stub.test

@@ -142,10 +142,11 @@ Symbols:
 # CHECK-NEXT:   EntrySize: 0
 # CHECK-NEXT: }
 
-# CHECK:      DynamicSection [ (4 entries)
+# CHECK:      DynamicSection [ (5 entries)
 # CHECK-NEXT:   Tag                Type   Name/Value
 # CHECK-NEXT:   0x[[DYNTABZ]]0000006 SYMTAB
 # CHECK-NEXT:   0x[[DYNTABZ]]0000005 STRTAB
+# CHECK-NEXT:   0x[[DYNTABZ]]000000A STRSZ
 # CHECK-NEXT:   0x[[DYNTABZ]]0000001 NEEDED Shared library: [libc.so.6]
 # CHECK-NEXT:   0x[[DYNTABZ]]0000000 NULL
 # CHECK-NEXT: ]