Port 193dcf76

Original Commit Message:

    Pair some stack ops so that they deal with an even numbers of registers, add
    padding around profile entry calls, and delete some unused macro assembler code.

R=martyn.capewell@arm.com, joransiu@ca.ibm.com, jyan@ca.ibm.com, bjaideep@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=
LOG=N

Change-Id: I017ccc699839b04bc7295d00c45e315f7cf074c1
Reviewed-on: https://chromium-review.googlesource.com/713996Reviewed-by: Junliang Yan <jyan@ca.ibm.com>
Reviewed-by: Joran Siu <joransiu@ca.ibm.com>
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#48473}