Version 4.2.77.14 (cherry-pick)

Merged d7f25f55

use a hash table for the function cache as blink is leaking functiontemplates

R=ulan@chromium.org
BUG=472608

Review URL: https://codereview.chromium.org/1053973002

Cr-Commit-Position: refs/branch-heads/4.2@{#16}
Cr-Branched-From: 3dfd929e-refs/heads/4.2.77@{#2}
Cr-Branched-From: e0110920-refs/heads/master@{#26757}