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cmd/compile: rewrite upper-bit-clear idiom to use shift-rotate
Old buggy hardware incorrectly executes the shift-left-K then shift-right-K idiom for clearing K leftmost bits. Use a right rotate instead of shift to avoid triggering the bug. Fixes #19809. Change-Id: I6dc646b183c29e9d01aef944729f34388dcc687d Reviewed-on: https://go-review.googlesource.com/39310 Run-TryBot: David Chase <drchase@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Russ Cox <rsc@golang.org>
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