[clang] [HLSL] Implement D3DCOLORtoUBYTE4 intrinsic (PR #122202)

[Finn Plummer via cfe-commits]

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@@ -0,0 +1,12 @@
+// RUN: %clang_cc1 -finclude-default-header -triple \
+// RUN:   dxil-pc-shadermodel6.3-library %s -fnative-half-type \
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inbelic wrote:

```suggestion
// RUN:   dxil-pc-shadermodel6.3-library %s \
```

https://github.com/llvm/llvm-project/pull/122202