Retry "Use a WeakCell in the CallIC type vector."
The first try failed because I needed to make a better distinction
between clearing ICs according to policy at GC time or unconditional
clearing (say, via %ClearFunctionTypeFeedback).
It was also blocked by an issue in super constructor calls.
This fix (https://codereview.chromium.org/
892113002/) needs to land
before checking in this CL.
R=ulan@chromium.org
Review URL: https://codereview.chromium.org/
866493003
Cr-Commit-Position: refs/heads/master@{#26420}