reorder seg regs for natural encoding
reorder seg regs for natural encoding

Change-Id: I1bbdcd52b7564f099f2188633aebc012ac5a16a3
(cherry picked from commit 12134326a3adc922f5d972c1c29c20b41b636fa8)

intelxed/xed,intelxed/xed,intelxed/xed,intelxed/xed