[llvm] [Bolt] Teach bolt about no-return functions (PR #115616)

[Gergely Bálint via llvm-commits]

bgergely0 wrote:

I think currently this marks all functions noreturn.  Can you please share an example code, and which functions this marks as noreturn and which it does not?

https://github.com/llvm/llvm-project/pull/115616