xgr kills condition code on the branch

R=joransiu@ca.ibm.com

Change-Id: I90a75760c96319d8f27512395f904796a114c5e9
Reviewed-on: https://chromium-review.googlesource.com/950135Reviewed-by: Joran Siu <joransiu@ca.ibm.com>
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#51748}