[libcxxabi] [llvm] [libc++abi] Avoid raw calls to assert() in libc++abi (PR #71121)

[Louis Dionne via llvm-commits]

ldionne wrote:

Thanks for the heads up. We can apply that work around upstream.

In the long term, we should actually merge libc++abi into libc++ so we can use the hardening mechanisms that are used by libc++ instead.

https://github.com/llvm/llvm-project/pull/71121