bug right shifting 64 bits by a variable that equals 32
bug right shifting 64 bits
by a variable that equals 32

R=rsc
CC=golang-dev
http://codereview.appspot.com/2645042

h8liu/golang,tv42/old-go,gnanderson/go,gnanderson/go,dsriram/golang,h8liu/golang,ssrl/go,h8liu/golang,dsriram/golang,apparentlymart/golang,apparentlymart/golang,gnanderson/go,ssrl/go,pombredanne/go-deleteme,gnanderson/go,dsriram/golang,tv42/old-go,tv42/old-go,dsriram/golang,ssrl/go,gnanderson/go,h8liu/golang,pombredanne/go-deleteme,apparentlymart/golang,dsriram/golang,dsriram/golang,apparentlymart/golang,ssrl/go,apparentlymart/golang,pombredanne/go-deleteme,tv42/old-go,h8liu/golang,h8liu/golang,pombredanne/go-deleteme,gnanderson/go,dsriram/golang,ssrl/go,tv42/old-go,apparentlymart/golang,ssrl/go,pombredanne/go-deleteme,tv42/old-go,pombredanne/go-deleteme,gnanderson/go,apparentlymart/golang,h8liu/golang,ssrl/go,pombredanne/go-deleteme,tv42/old-go