[clang] [llvm] [SPIRV][HLSL] Add DXC compatibility option for extension (PR #151554)

[Chris B via llvm-commits]

================
@@ -173,24 +173,78 @@ bool isLegalValidatorVersion(StringRef ValVersionStr, const Driver &D) {
   return true;
 }
 
+std::string getSpirvExtOperand(llvm::StringRef SpvExtensionArg) {
+  // The extensions that are commented out are supported in DXC, but the SPIR-V
+  // backend does not know about them yet.
+  static const std::vector<std::string> DxcSupportedExtensions = {
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llvm-beanz wrote:

```suggestion
  static const std::vector<StringRef> DxcSupportedExtensions = {
```

https://github.com/llvm/llvm-project/pull/151554