[clang] [clang][AST] Add ASTContext::hasLayout() (PR #216541)

[Timm Baeder via cfe-commits]

================
@@ -1638,7 +1638,7 @@ static RegionOffset calculateOffset(const MemRegion *R) {
       }
 
       const CXXRecordDecl *Child = Ty->getAsCXXRecordDecl();
-      if (!Child) {
+      if (!Child || !ASTContext::hasLayout(Child)) {
----------------
tbaederr wrote:

No, it immediately does `D = D->getDefinition()`, so `D` can't be null.

https://github.com/llvm/llvm-project/pull/216541
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