[llvm] [Profile] Add a more descriptive message to the bad_header error (PR #211281)

[Wael Yehia via llvm-commits]

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@@ -101,6 +101,10 @@ static std::string getInstrProfErrString(instrprof_error Err,
   case instrprof_error::bad_header:
     OS << "invalid instrumentation profile data (file header is corrupt)";
     break;
+  case instrprof_error::header_size_mismatch:
+    OS << "profile file size does not match header expectations (file may be "
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w2yehia wrote:

done

https://github.com/llvm/llvm-project/pull/211281