Port 37bc0358

Original Commit Message:

    Lift the declaration of the heap allocation request list and the method
    which adds to the list up to AssemblerBase.

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

Change-Id: I31d63789c25ce70ee17c48fecb2051ac7a30fd92
Reviewed-on: https://chromium-review.googlesource.com/1101254Reviewed-by: Joran Siu <joransiu@ca.ibm.com>
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#53745}