Port 17c8ffea

Original commit message:
Turbofan needs to pass vector slots around for named and keyed stores.
Also, the CL addresses a missing slot for ClassLiterals.

R=mvstanton@chromium.org, dstence@us.ibm.com, michael_dawson@ca.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1201983005

Cr-Commit-Position: refs/heads/master@{#29198}