Hello rsc (cc: golang-dev@googlegroups.com), I'd like you to review this change.
LGTM
*** Submitted as http://code.google.com/p/go/source/detail?r=412146b2391f *** big/arith: assembly routines for 386 long shifts (2nd round) R=rsc CC=golang-dev http://codereview.appspot.com/986044