[libcxx-commits] [libcxx] [libc++][hardening] In production hardening modes, trap rather than abort (PR #78561)

[Konstantin Varlamov via libcxx-commits]

var-const wrote:

Note on the CI before merging:
1. The few stage 3 failures are spurious (cancelled jobs for `bootstrapping-build`, `generic-msan` and `no-tzdb`). There is no reason to suspect that this jobs might not succeed, and they did succeed on a previous version of this patch.
2. The `picolibc` failures on [Buildkite](https://buildkite.com/llvm-project/libcxx-ci/builds/33012#_) (the `ARM` jobs) are known issues and unrelated.
3. The Windows and FreeBSD jobs on [Buildkite](https://buildkite.com/llvm-project/libcxx-ci/builds/33012#_) have been still waiting for an agent at the time of merge. These jobs are currently heavily backlogged. There is no particular reason to suspect this would fail on those platforms. I will proceed with the merge, making sure to address any problems should those jobs eventually fail.

https://github.com/llvm/llvm-project/pull/78561