[clang] Add support for builtin_verbose_trap (PR #79230)

[Konstantin Varlamov via cfe-commits]

var-const wrote:

@dwblaikie @ahatanak Is there anything we can do to move this patch forward? It seems like it's almost ready to go with perhaps one remaining thread of conversation to address. We badly need this functionality in libc++, the lack of error messages when a hardening check is triggered results in very poor user experience. It also makes it harder to talk about hardening since we essentially need to describe both the current state and the state after this patch is merged.


https://github.com/llvm/llvm-project/pull/79230