[llvm] [llvm][Support] Add support for thread naming for Haiku (PR #107646)

[Brad Smith via llvm-commits]

brad0 wrote:

I saw a post about this the other day when I was looking around but wasn't sure if it was committed, but it turns out Haiku already has the pthread_setname_np() / pthread_getname_np() API.

https://github.com/haiku/haiku/commit/44cceee67e056d8e34cb017d5f5c07b9fac874c0

https://github.com/llvm/llvm-project/pull/107646