cmd/compile: perform minimal phi elimination during critical
Phi splitting sometimes leads to a phi with only a single predecessor. This must be replaced with a copy to maintain a valid SSA form. Fixes #14857 Change-Id: I5ab2423fb6c85a061928e3206b02185ea8c79cd7 Reviewed-on: https://go-review.googlesource.com/20826Reviewed-by: Keith Randall <khr@golang.org>
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