hokein added inline comments.

================
Comment at: clang/lib/AST/ASTContext.cpp:2463
 
-    unsigned PreferredAlign = static_cast<unsigned>(
-        toBits(getASTRecordLayout(RT->getDecl()).PreferredAlignment));
-    assert(PreferredAlign >= ABIAlign &&
-           "PreferredAlign should be at least as large as ABIAlign.");
-    return PreferredAlign;
+    if (!RT->getDecl()->isInvalidDecl()) {
+      unsigned PreferredAlign = static_cast<unsigned>(
----------------
another proper fix might be change the `getPreferredTypeAlign` signature to 
support error handling (e.g. return a bool), but that would require a large 
invasive change for its callers, not sure it is worth.

I think the current implementation is OK, as the result doesn't really matter 
for an invalid RecordDecl, and we do similar thing int `getTypeInfoImpl` 
(returning a fake `Align`/`Width` for invalid decl).  


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D85834/new/

https://reviews.llvm.org/D85834

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