6g: fix registerization of temporaries
6g: fix registerization of temporaries

Use correct range in allocated register test.

R=rsc, ken2
CC=golang-dev
http://codereview.appspot.com/4073049

Committer: Russ Cox <5ad239cb8a44f659eaaee0aa1ea5b94947abe557@golang.org>

h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang