[clang] Fix a use-after free in ASTContext::getSubstBuiltinTemplatePack (#160970) ASTContext::getSubstBuiltinTemplatePack finds InsertPos and then calls itself recursively, which may lead to rehashing and invalidation of all pointers to buckets. The function then proceeds with using the potentially invalid InsertPos, leading to use-after-free. The issue goes back to https://github.com/llvm/llvm-project/pull/157662. I didn't manage to produce a reasonably-sized test case yet.
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