runtime: simplify/optimize allocate-black a bit
Currently allocating black switches to the system stack (which is probably a historical accident) and atomically updates the global bytes marked stat. Since we're about to depend on this much more, optimize it a bit by putting it back on the regular stack and updating the per-P bytes marked stat, which gets lazily folded into the global bytes marked stat. Change-Id: Ibbe16e5382d3fd2256e4381f88af342bf7020b04 Reviewed-on: https://go-review.googlesource.com/22170Reviewed-by:Rick Hudson <rlh@golang.org> Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
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