folly: improve setThreadName for macOS
Summary: Since OS X 10.6 it is possible to set the name of the current thread. This diff adjusts our setThreadName routine to do this, partially fixing the associated test case. Even though this doesn't completely cover all cases it is still a valid improvement: most callers are threads setting their own name. I've amended the tests so that they can accomodate systems that cannot set the names of other threads. Reviewed By: yfeldblum Differential Revision: D3576281 fbshipit-source-id: 13caf0dca6496aa2da897631e8d7327a6ee452bb
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