cmd/compile: Improve const shifts in PPC64.rules
This change updates PPC64.rules to recognize constant shift counts and generate more efficient code sequences in those cases. Fixes #17336 Change-Id: I8a7b812408d7a68388df41e42bad045dd214be17 Reviewed-on: https://go-review.googlesource.com/30310 Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by:David Chase <drchase@google.com>
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