[clang][HLSL] Fix crash issue due to Twine usage

- Dangling pointer (from std::string) is created and trigger crash on
  some Linux distributions under different build types.

Author: darkbuck

clang/lib/Sema/SemaHLSL.cpp

@@ -940,8 +940,7 @@ void SemaHLSL::checkSemanticAnnotation(
       DiagnoseAttrStageMismatch(SemanticAttr, ST, {llvm::Triple::Compute});
 
     if (SemanticAttr->getSemanticIndex() != 0) {
-      Twine PrettyName =
-          std::string("'") + SemanticAttr->getSemanticName() + "'";
+      Twine PrettyName = "'" + SemanticAttr->getSemanticName() + "'";
       Diag(SemanticAttr->getLoc(),
            diag::err_hlsl_semantic_indexing_not_supported)
           << PrettyName.str();