cmd/compile: use proper magnitude for (x>>c) & uppermask = 0 This is followup of CL 228860, which rewrite shift rules to use typed aux. That CL introduced nlz* functions, to refactor left shift rules. While at it, we realize there's a bug in old rules with both right/left shift rules, but only fix for left shift rules only. This CL fixes the bug for right shift rules. Passes toolstash-check. Change-Id: Id8f2158b1b66c9e87f3fdeaa7ae3e35dc0666f8b Reviewed-on: https://go-review.googlesource.com/c/go/+/229137 Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com> Reviewed-by: Keith Randall <khr@golang.org>
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