runtime: clean up gcMarkDone
This improves the documentation comment on gcMarkDone, replaces a recursive call with a simple goto, and disables preemption before stopping the world in accordance with the documentation comment on stopTheWorldWithSema. Updates #13363, but, sadly, doesn't fix it. Change-Id: I6cb2a5836b35685bf82f7b1ce7e48a7625906656 Reviewed-on: https://go-review.googlesource.com/17149Reviewed-by:Rick Hudson <rlh@golang.org> Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
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