Port ca1d44e3

Original Commit Message:

    If enabled, this mode moves code for isolate-independent builtins off
    the JS heap at Isolate creation. The Code object itself is rewritten
    to tail-call the off-heap instruction stream.

R=jgruber@chromium.org, joransiu@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=
LOG=N

Change-Id: Ia1b14663c17308101ce5e952fd508c891a098f8d
Reviewed-on: https://chromium-review.googlesource.com/899105Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#51077}