To replace the progeffects tables for liveness analysis.

Change-Id: Idc4b990665cb0a9aa300d62cdf8ad12e51c5b991
Reviewed-on: https://go-review.googlesource.com/38083
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>