Port 87557649

Original Commit Message:

    This changes DoubleToIStub to return its result on the stack instead
    of a specific return register.

    In a follow-up, the DoubleToIStub could be converted into a builtin.

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

Change-Id: I952fec4fbe004e2734a84ba853f4f5a33c8dd8ce
Reviewed-on: https://chromium-review.googlesource.com/1013418Reviewed-by: Junliang Yan <jyan@ca.ibm.com>
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#52605}