cmd/compile: Optimize ARM64's code with EON
This patch fuses pattern '(MVN (XOR x y))' into '(EON x y)'. Change-Id: I269c98ce198d51a4945ce8bd0e1024acbd1b7609 Reviewed-on: https://go-review.googlesource.com/c/go/+/239638 Run-TryBot: Cherry Zhang <cherryyz@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by:Cherry Zhang <cherryyz@google.com>
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