runtime: use cgo traceback for SIGPROF
If we collected a cgo traceback when entering the SIGPROF signal handler, record it as part of the profiling stack trace. This serves as the promised test for https://golang.org/cl/21055 . Change-Id: I5f60cd6cea1d9b7c3932211483a6bfab60ed21d2 Reviewed-on: https://go-review.googlesource.com/22650 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by:Austin Clements <austin@google.com>
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