[libcxx-commits] [libcxx] [libc++] Add assert test for string assign/append (PR #207164)

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c8ef wrote:

Now the hardening tests passed. Not sure if my test options look good, IIUC the nullptr check does not work in the fast mode.

The generic-llvm-libc test failed because kernel.org release 404.

https://github.com/llvm/llvm-project/pull/207164