Descriptionruntime: mark race instrumentation callbacks as nosplitstack
It speedups the race detector somewhat, but also prevents
getcallerpc() from obtaining lessstack().
Patch Set 1 #Patch Set 2 : diff -r 10993a316040 https://dvyukov%40google.com@code.google.com/p/go/ #Patch Set 3 : diff -r 10993a316040 https://dvyukov%40google.com@code.google.com/p/go/ #Patch Set 4 : diff -r 10993a316040 https://dvyukov%40google.com@code.google.com/p/go/ #MessagesTotal messages: 3
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