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

[Chris B via llvm-commits]

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@@ -371,7 +431,7 @@ HLSLToolChain::TranslateArgs(const DerivedArgList &Args, StringRef BoundArch,
     std::vector<std::string> SpvExtensionArgs =
         Args.getAllArgValues(options::OPT_fspv_extension_EQ);
     if (checkExtensionArgsAreValid(SpvExtensionArgs, getDriver())) {
-      std::string LlvmOption = getSpirvExtArg(SpvExtensionArgs);
+      llvm::SmallString<1024> LlvmOption = getSpirvExtArg(SpvExtensionArgs);
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llvm-beanz wrote:

```suggestion
     SmallString<1024> LlvmOption = getSpirvExtArg(SpvExtensionArgs);
```

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