Port d3f074b2

Original commit message:
    We'll be able to optimize rest parameters in TurboFan similarly to
    the arguments array. This CL restores the previous behavior, and a
    follow-on will enable TurboFan optimization.

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

Review URL: https://codereview.chromium.org/1549743003

Cr-Commit-Position: refs/heads/master@{#33028}