[pull] master from JuliaLang:master #1800
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* Avoid incrementing reentrant_timing, store start times on stack * Remove reentrant_inference, encode in reentrant_timing * Remove test-and-lock-and-test idiom
Attempt an experiment: remove arrays that only have one value. Seems to save about 0.8% (1MB) in the sysimg, since we were rather significantly over-sizing these (about 16 slots initialized) before. Also a small lookup-failure optimization for the hashing-failed case to avoid duplicated work.
POSIX.1-2008 marks `getitimer`/`setitimer` obsolete in favor of `timer_gettime`/`timer_settime`. Additionally, POSIX.1-2017 marks `SIGPROF` obsolete. Thus we can make simply have FreeBSD use the same signals code paths as Linux, which already uses the timer API and uses `SIGUSR1` rather than `SIGPROF`. The code conditional on the `HAVE_ITIMER` flag, as well as the flag itself, have been removed since they're no longer used.
In the unlikely event this call fails, we can either confidently
conclude the result will always fail and stop inference immediately
there. Or we can at least conclude that the base type is confidently
known, which can potentially improve ml-matches performance later by
excluding Union{} or other subtypes.
Add GC stat: `total_time_to_safepoint`
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