runtime: do not treat asmcgocall as a topofstack on g0 This was added in 2018 to fix a runtime crash during unwind during a unhandled-panic-induced crash. (See https://golang.org/cl/90895 and #23576.) Clearly we cannot unwind past this function, and the change did stop the unwind. But it's not a top-of-stack function, and the real issue is that SP is changed. The new SPWRITE bit takes care of this instead, so we can drop it from the topofstack function. At this point the topofstack function is only checking the TOPFRAME bit, so we can inline that into the one call site. This CL is part of a stack adding windows/arm64 support (#36439), intended to land in the Go 1.17 cycle. This CL is, however, not windows/arm64-specific. It is cleanup meant to make the port (and future ports) easier. Change-Id: I856552298032770e48e06c95a20823a1dbd5e38c Reviewed-on: https://go-review.googlesource.com/c/go/+/288805 Trust: Russ Cox <rsc@golang.org> Reviewed-by: Cherry Zhang <cherryyz@google.com>
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