[compiler-rt] [compiler-rt][nsan] Add two steps in init process (PR #98807)

[Dmitriy Chestnykh via llvm-commits]

chestnykh wrote:

> Disabling core dumps makes sense.
> 
> [google/sanitizers#637](https://github.com/google/sanitizers/issues/637) describes why many sanitizers install signal handlers. But nsan doesn't deal with these undefined behaviors and perhaps doesn't need it?

Okay, i thought that signal handler is installed to have detail report about crashes caused by signal :)

https://github.com/llvm/llvm-project/pull/98807