big/arith: assembly routines for 386 long shifts (2nd round)
big/arith: assembly routines for 386 long shifts (2nd round)

R=rsc
CC=golang-dev
http://codereview.appspot.com/986044

pombredanne/go-deleteme,pombredanne/go-deleteme,ssrl/go,dsriram/golang,ssrl/go,ssrl/go,apparentlymart/golang,tianon/debian-golang,gnanderson/go,tv42/old-go,h8liu/golang,tv42/old-go,bdwalton/debian-golang,apparentlymart/golang,gnanderson/go,apparentlymart/golang,dsriram/golang,bdwalton/debian-golang,nightlyone/golang,h8liu/golang,h8liu/golang,ssrl/go,apparentlymart/golang,pombredanne/go-deleteme,bdwalton/debian-golang,tianon/debian-golang,pombredanne/go-deleteme,nightlyone/golang,dsriram/golang,pombredanne/go-deleteme,tv42/old-go,pombredanne/go-deleteme,bdwalton/debian-golang,bdwalton/debian-golang,h8liu/golang,tianon/debian-golang,tianon/debian-golang,dsriram/golang,tv42/old-go,nightlyone/golang,gnanderson/go,ssrl/go,tianon/debian-golang,tianon/debian-golang,dsriram/golang,gnanderson/go,dsriram/golang,tv42/old-go,nightlyone/golang,nightlyone/golang,h8liu/golang,gnanderson/go,ssrl/go,nightlyone/golang,apparentlymart/golang,bdwalton/debian-golang,tianon/debian-golang,tv42/old-go,tianon/debian-golang,h8liu/golang,ssrl/go,h8liu/golang,gnanderson/go,tv42/old-go,apparentlymart/golang,nightlyone/golang,gnanderson/go,bdwalton/debian-golang,apparentlymart/golang,pombredanne/go-deleteme,dsriram/golang,bdwalton/debian-golang