Port 2d1f977c

Original commit message:

    Support for relocatable globals, to facilitate compilation before
    instantiation.

R=mtrofin@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, mbrandy@us.ibm.com, bjaideep@ca.ibm.com

BUG=v8:5072
LOG=N

Review-Url: https://codereview.chromium.org/2071883002
Cr-Commit-Position: refs/heads/master@{#37041}