runtime: avoid conditional execution in morePointers and isPointer
heapBits.bits is carefully written to produce good machine code. Use it in heapBits.morePointers and heapBits.isPointer to get good machine code there, too. Change-Id: I208c7d0d38697e7a22cad67f692162589b75f1e2 Reviewed-on: https://go-review.googlesource.com/22630Reviewed-by:Rick Hudson <rlh@golang.org> Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
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