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bbc7e8429b
While profiling I noticed that gettid() was hitting gs register twice, once for the initial fetch of s_cache_tid out of TLS for the initialization check, and then again when we return the actual value. Optimize the implementation to cache the value so we avoid the double fetch during the 99% case where it's already set. With this change gettid() goes from being the 3rd most sampled function in test-js, to pretty much disappearing into ~20th place. Additionally add the same optimization to getpid().