[compiler-rt] [rtsan][Apple] Add interceptor for _os_nospin_lock_lock (PR #131034)

[Chris Apple via llvm-commits]

cjappl wrote:

Also if this is merged and tests are happy, we may consider cherry picking to the llvm 20 release branch as this is "expected behavior" for that version. 

It would be good to get in the next release if we feel good about it.

https://github.com/llvm/llvm-project/pull/131034