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

[Sarah Spall via cfe-commits]

================
@@ -2016,8 +2016,9 @@ TypeInfo ASTContext::getTypeInfoImpl(const Type *T) const 
{
   case Type::Vector: {
     const auto *VT = cast<VectorType>(T);
     TypeInfo EltInfo = getTypeInfo(VT->getElementType());
-    Width = VT->isExtVectorBoolType() ? VT->getNumElements()
-                                      : EltInfo.Width * VT->getNumElements();
+    Width = (VT->isExtVectorBoolType() && !getLangOpts().HLSL)
----------------
spall wrote:

I will investigate doing this because I also don't like all the special case 
checking for HLSL. 

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