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Currently there are two sensitive periods during which a mutator can
allocate past the heap goal but mutator assists can't be enabled: 1)
at the beginning of GC between when the heap first passes the heap
trigger and sweep termination and 2) at the end of GC between mark
termination and when the background GC goroutine parks. During these
periods there's no back-pressure or safety net, so a rapidly
allocating mutator can allocate past the heap goal. This is
exacerbated if there are many goroutines because the GC coordinator is
scheduled as any other goroutine, so if it gets preempted during one
of these periods, it may stay preempted for a long period (10s or 100s
of milliseconds).

Normally the mutator does scan work to create back-pressure against
allocation, but there is no scan work during these periods. Hence, as
a fall back, if a mutator would assist but can't yet, simply yield the
CPU. This delays the mutator somewhat, but more importantly gives more
CPU time to the GC coordinator for it to complete the transition.

This is obviously a workaround. Issue #11970 suggests a far better but
far more invasive way to fix this.

Updates #11911. (This very nearly fixes the issue, but about once
every 15 minutes I get a GC cycle where the assists are enabled but
don't do enough work.)

Change-Id: I9768b79e3778abd3e06d306596c3bd77f65bf3f1
Reviewed-on: https://go-review.googlesource.com/13026

Reviewed-by: Russ Cox <rsc@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>