runtime: preserve signal stack when calling Go on C thread
When calling a Go function on a C thread, if the C thread already has an alternate signal stack, use that signal stack instead of installing a new one. Update #9896. Change-Id: I62aa3a6a4a1dc4040fca050757299c8e6736987c Reviewed-on: https://go-review.googlesource.com/18108Reviewed-by:Russ Cox <rsc@golang.org>
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