[clang] [HLSL] Remove support for constructors for user defined structs (PR #190089)

[Helena Kotas via cfe-commits]

================
@@ -1527,7 +1527,10 @@ CodeGenFunction::EmitAutoVarAlloca(const VarDecl &D) {
     if (D.getInit() && (Ty->isArrayType() || Ty->isRecordType()) &&
         (D.isConstexpr() ||
          ((Ty.isPODType(getContext()) ||
-           getContext().getBaseElementType(Ty)->isObjCObjectPointerType()) &&
+           getContext().getBaseElementType(Ty)->isObjCObjectPointerType() ||
+           // check if it is a constant initializer if HLSL because PODness
+           // will no longer be true for any user defined structs
----------------
hekota wrote:

Why can't the user defined structs be POD anymore? It would seem they are more likely to be POD without the constructors.

https://github.com/llvm/llvm-project/pull/190089