big: fix arm build - forgot how to spell JMP
big: fix arm build - forgot how to spell JMP

Fixes issue 269.

TBR=kaib
http://codereview.appspot.com/156107

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