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

[Greg Roth via cfe-commits]

================
@@ -11533,6 +11539,18 @@ QualType ASTContext::mergeTypes(QualType LHS, QualType 
RHS, bool OfBlockPointer,
       return {};
     return LHS;
   }
+  case Type::HLSLAttributedResource: {
+    const HLSLAttributedResourceType *LHSTy =
+        LHS->castAs<HLSLAttributedResourceType>();
+    const HLSLAttributedResourceType *RHSTy =
+        RHS->castAs<HLSLAttributedResourceType>();
+
+    if (LHSTy->getWrappedType() == RHSTy->getWrappedType() &&
----------------
pow2clk wrote:

Not objecting so much as confirming I understand, but isn't the wrapped type 
always the same `__hlsl_resource_t`?

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