Change x86 prefix order

[H. J. Lu]

On x86, the order of prefix SEG_PREFIX, ADDR_PREFIX, DATA_PREFIX and
LOCKREP_PREFIX isn't fixed. Currently, gas generates

LOCKREP_PREFIX ADDR_PREFIX DATA_PREFIX SEG_PREFIX

I will check in a patch:

http://sourceware.org/ml/binutils/2006-12/msg00054.html

tomorrow and change gas to generate

SEG_PREFIX ADDR_PREFIX DATA_PREFIX LOCKREP_PREFIX


H.J.