Port 5de27c34

Original commit message:
    Calls use registers for target, new_target and argument count.
    We don't always respect argument count. It didn't bite us in the past
    because the code paths where we clobbered it never used it, though
    in future it could be an issue.

R=mvstanton@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1687943002

Cr-Commit-Position: refs/heads/master@{#33878}