runtime: run concurrent mark phase on regular stack
Currently, the GC's concurrent mark phase runs on the system stack. There's no need to do this, and running it this way ties up the entire M and P running the GC by preventing the scheduler from preempting the GC even during concurrent mark. Fix this by running concurrent mark on the regular G stack. It's still non-preemptible because we also set preemptoff around the whole GC process, but this moves us closer to making it preemptible. Change-Id: Ia9f1245e299b8c5c513a4b1e3ef13eaa35ac5e73 Reviewed-on: https://go-review.googlesource.com/7730Reviewed-by: Rick Hudson <rlh@golang.org>
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