Merged PR 5769: Replace incorrect sizeof() with strlen() in compiler version test

Replace incorrect sizeof() with strlen() in compiler version test

This would produce a failure only on x86 because it sizeof() gave the size
of a pointer, which just so happens to be the hard coded size of the hash
on x64. On x86, it would advance only 4 bytes, and fail the comparison.

This also checks to see if the VersionStringListSizeInBytes is > 2 more than the hash size, because both null-terminators are always added, so it will always be at least 2 more, even with no CustomVersionString.

tools/clang/unittests/HLSL/DxilContainerTest.cpp

@@ -2110,10 +2110,12 @@ TEST_F(DxilContainerTest, DxilContainerCompilerVersionTest) {
 
   if (pDCV->VersionStringListSizeInBytes != 0) {
     LPCSTR pCommitHashStr = (LPCSTR)pDCV + sizeof(hlsl::DxilCompilerVersion);
+    uint32_t uCommitHashLen = (uint32_t)strlen(pCommitHashStr);
 
     VERIFY_ARE_EQUAL_STR(pCommitHashStr, pCommitHashRef);
-    if (pDCV->VersionStringListSizeInBytes > sizeof(pCommitHashStr) + 1) {
-      LPCSTR pCustomVersionString = pCommitHashStr + sizeof(pCommitHashStr) + 1;
+    // + 2 for the two null terminators that are included in this size:
+    if (pDCV->VersionStringListSizeInBytes > uCommitHashLen + 2) {
+      LPCSTR pCustomVersionString = pCommitHashStr + uCommitHashLen + 1;
       VERIFY_ARE_EQUAL_STR(pCustomVersionString, pCustomVersionStrRef)
     }
   }