[clang-tools-extra] [clang-tidy] Add check 'bugprone-unsafe-to-allow-exceptions' (PR #176430)

[Balázs Kéri via cfe-commits]

balazske wrote:

> I was initially a little confused by check name, maybe `bugprone-exception-unsafe-functions` is better, WDYT?

I think that name can be confusing because the check does not find any of the unsafe functions, only if the exceptions are explicitly allowed in an unsafe function.

https://github.com/llvm/llvm-project/pull/176430