cmd/compile: improve generic rules for BCE based on AND operations.
Match more patterns generated by the compiler where the index for a bound check is bounded through a AND operation, with different register sizes. These rules trigger a dozen of times in a bootstrap. Change-Id: Ic9fff16f21d08580f19a366c3ee1a372e58357d1 Reviewed-on: https://go-review.googlesource.com/37442 TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by:Keith Randall <khr@golang.org>
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