cmd/compile: reuse blocks in critical pass

cmd/compile: reuse blocks in critical pass

If a phi has duplicate arguments, then the new block that is constructed
to remove the critical edge can be used for all of the duplicate
arguments.

read-only data = -904 bytes (-0.058308%)
global text (code) = -2240 bytes (-0.060056%)
Total difference -3144 bytes (-0.056218%)

Change-Id: Iee3762744d6a8c9d26cdfa880bb23feb62b03c9c
Reviewed-on: https://go-review.googlesource.com/20746
Run-TryBot: Todd Neal <todd@tneal.org>
Reviewed-by: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>