use StoreDouble and LoadDouble function to avoid overflowing
offset used in std and ld

R=joransiu@ca.ibm.com, michael_dawson@ca.ibm.com, bjaideep@ca.ibm.com
BUG=

Review-Url: https://codereview.chromium.org/2492913002
Cr-Commit-Position: refs/heads/master@{#40907}