[libcxx-commits] [libcxx] [libc++] Make bad_function_call::what() existence a matter of availability instead of ABI (PR #127697)

[Louis Dionne via libcxx-commits]

https://github.com/ldionne approved this pull request.

This LGTM. However, since I do expect we might run into some unforeseen issues with this change, let me take it for a spin internally just to see if anything breaks. But assuming that's not the case, let's ship this. I'll let you know early next week.

https://github.com/llvm/llvm-project/pull/127697