Revert of Do not embed constant functions in StoreTransition stub. (patchset #3 id:40001 of https://codereview.chromium.org/769733003/)

Reason for revert:
GC stress failure: http://build.chromium.org/p/client.v8/builders/V8%20Mac%20GC%20Stress%20-%201/builds/1038

Original issue's description:
> Do not embed constant functions in StoreTransition stub.
>
> BUG=v8:3629
> LOG=N

TBR=ishell@google.com,ishell@chromium.org,ulan@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=v8:3629

Review URL: https://codereview.chromium.org/785253002

Cr-Commit-Position: refs/heads/master@{#25728}