[llvm][Support] thread_local
threadid on Apple systems
#87219
Merged
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I was profiling our compiler and noticed that
llvm::get_threadid
was at the top of the hotlist, taking up a surprising 5% (7 seconds) in the profile trace. It seems that computing this on MacOS systems is non-trivial, so cache the result in a thread_local.Co-authored-by: Mehdi Amini joker.eph@gmail.com