runtime: say when a goroutine is locked to OS thread
Say when a goroutine is locked to OS thread in crash reports and goroutine profiles. It can be useful to understand what goroutines consume OS threads (syscall and locked), e.g. if you forget to call UnlockOSThread or leak locked goroutines. R=golang-codereviews CC=golang-codereviews, rsc https://golang.org/cl/94170043
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