[clang] [HLSL] Make memory representation of boolean vectors in HLSL, vectors of i32. Add support for boolean swizzling. (PR #123977)

[Eli Friedman via cfe-commits]

================
@@ -1984,6 +1984,15 @@ llvm::Constant *ConstantEmitter::emitForMemory(CodeGenModule &CGM,
     return Res;
   }
 
+  // In HLSL bool vectors are stored in memory as a vector of i32
+  if (destType->isExtVectorBoolType() && CGM.getContext().getLangOpts().HLSL) {
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efriedma-quic wrote:

```suggestion
  if (destType->isExtVectorBoolType() && !destType->isPackedVectorBoolType(Ctx)) {
```

Same for other places where you explicitly check for HLSL.

https://github.com/llvm/llvm-project/pull/123977