[clang] [HLSL] Make HLSLAttributedResourceType canonical and add code paths to convert HLSL types to DirectX target types (PR #110327)

[Damyan Pepper via cfe-commits]

================
@@ -4488,6 +4488,30 @@ void CXXNameMangler::mangleType(const ArrayParameterType 
*T) {
   mangleType(cast<ConstantArrayType>(T));
 }
 
+void CXXNameMangler::mangleType(const HLSLAttributedResourceType *T) {
+  mangleType(T->getWrappedType());
+  const HLSLAttributedResourceType::Attributes &Attrs = T->getAttrs();
+  switch (Attrs.ResourceClass) {
+  case llvm::dxil::ResourceClass::UAV:
+    Out << 'U';
----------------
damyanp wrote:

I think I know why you chose these letters for the mangling....but future 
readers may not have that context. A comment here might be helpful.

https://github.com/llvm/llvm-project/pull/110327
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