[clang] [compiler-rt] Realtime Sanitizer: Introduce RADSan backend (PR #92460)

[Chris Apple via llvm-commits]

cjappl wrote:

Pinging possibly interested parties for review. 

@yln @vitalybuka @Sirraide @AaronBallman @dougsonos @davidtrevelyan 

Please feel free to add more, we don't know who all may be interested. Thanks in advance

https://github.com/llvm/llvm-project/pull/92460