runtime: document relaxed access to arena_used
The unsynchronized accesses to mheap_.arena_used in the concurrent part of the garbage collector look like a problem waiting to happen. In fact, they are safe, but the reason is somewhat subtle and undocumented. This commit documents this reasoning. Related to issue #9984. Change-Id: Icdbf2329c1aa11dbe2396a71eb5fc2a85bd4afd5 Reviewed-on: https://go-review.googlesource.com/11254Reviewed-by:Dmitry Vyukov <dvyukov@google.com>
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