cmd/compile: implement constant rotates on arm64
Explicit constant rotates work, but constant arguments to bits.RotateLeft* needed the additional rule. Fixes #48465 Change-Id: Ia7544f21d0e7587b6b6506f72421459cd769aea6 Reviewed-on: https://go-review.googlesource.com/c/go/+/350909 Trust: Keith Randall <khr@golang.org> Trust: Josh Bleecher Snyder <josharian@gmail.com> Run-TryBot: Keith Randall <khr@golang.org> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by:Josh Bleecher Snyder <josharian@gmail.com>
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