runtime: support for injecting calls at signals on x86 This adds a sigctxt.pushCall method that pushes a call at the signaled site. We'll use this to inject asynchronous preemptions and in some places we use it to clean up preparePanic. For the moment this only works on 386 and amd64. We stub it out on other platforms and will avoid calling the stubbed version. For #10958, #24543. Change-Id: I49e0e853f935d32dd67a70c6cafbae44ee68af8e Reviewed-on: https://go-review.googlesource.com/c/go/+/201758 Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Cherry Zhang <cherryyz@google.com>
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