Update clang/lib/CodeGen/HLSLBufferLayoutBuilder.cpp

Co-authored-by: Eli Friedman <[email protected]>

Author: spall

clang/lib/CodeGen/HLSLBufferLayoutBuilder.cpp

@@ -195,8 +195,7 @@ bool HLSLBufferLayoutBuilder::layoutField(const FieldDecl *FD,
     // Unwrap array to find the element type and get combined array size.
     QualType Ty = FieldTy;
     while (Ty->isConstantArrayType()) {
-      const ConstantArrayType *ArrayTy =
-          cast<ConstantArrayType>(Ty->getUnqualifiedDesugaredType());
+      auto *ArrayTy = CGM.getContext().getAsConstantArrayType(Ty);
       ArrayCount *= ArrayTy->getSExtSize();
       Ty = ArrayTy->getElementType();
     }