runtime/race: update race runtime
This updates the runtime to HEAD to keep it aligned and fixes some bugs. http://llvm.org/viewvc/llvm-project?view=revision&revision=285454 fixes the crash on darwin related to unaligned data section (#17065). http://llvm.org/viewvc/llvm-project?view=revision&revision=285451 enables core dumps by default (#16527). http://llvm.org/viewvc/llvm-project?view=revision&revision=285455 adds a hook to obtain number of races reported so far (#15972). Can now be obtained with: //go:nosplit func RaceReportCount() int { var n uint64 racecall(&__tsan_report_count, uintptr(unsafe.Pointer(&n)), 0, 0, 0) return int(n) } Fixes #16527. Fixes #17065. Update #15972. Change-Id: I8f869cb6275c9521a47303f3810a9965e9314357 Reviewed-on: https://go-review.googlesource.com/32160 Run-TryBot: Dmitry Vyukov <dvyukov@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
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