[clang] [Matrix] Use matrix element type for TBAA nodes. (PR #190029)

[Florian Hahn via cfe-commits]

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@@ -329,6 +329,10 @@ llvm::MDNode *CodeGenTBAA::getTypeInfoHelper(const Type *Ty) {
   if (CodeGenOpts.NewStructPathTBAA && Ty->isArrayType())
     return getTypeInfo(cast<ArrayType>(Ty)->getElementType());
 
+  // Accesses to matrix types are accesses to objects of their element types.
+  if (const auto *MTy = dyn_cast<ConstantMatrixType>(Ty))
+    return getTypeInfo(MTy->getElementType());
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fhahn wrote:

Only `ConstantMatrixType` should reach codegen. I updated the code to use `dyn_cast<MatrixType>` and asserted that it always is `ConstantMatrixType`, thanks

https://github.com/llvm/llvm-project/pull/190029