Rollup merge of rust-lang#128158 - workingjubilee:unsafe-wrap-persona…

…lity-gcc, r=ChrisDenton

std: unsafe-wrap personality::gcc

Nothing seems obviously wrong with these implementations except for some unanswered questions. Admittedly, I don't want to burn excessive time on exceptional exception handlers. Thus this is mostly a brute-force syntactic wrapping and some comments where they seemed correct, creating another largely whitespace diff.

try-job: armhf-gnu