5l: two stack split bugs in one day
5l: two stack split bugs in one day

An ARM expert could probably phrase the
comparison in fewer instructions, but this works.

R=ken2
CC=golang-dev
http://codereview.appspot.com/2620041

tav/go,tav/go,tav/go,tav/go,tav/go,tav/go,tav/go