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

[David Blaikie via cfe-commits]

dwblaikie wrote:

Hmm, do other builtins actually end up as symbol names? I think most of them lower to an instruction or two - I guess this one doesn't lower to an actual symbol, only a DWARF symbol - but maybe that's still different enough it should use an llvm or clang in the name... (sorry, I think I saw this was discussed somewhere on the review, but I can't find where now... :/)

I guess it came up here: https://github.com/llvm/llvm-project/pull/79230#discussion_r1591335258 and at the time it still had `llvm` in it, wasn't clear conversation that showed how the alternative conclusion was reached.

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