This is mostly a performance experiment. If it provides no speedup,
it can be reverted to keep IC miss events in timeline plots.
Otherwise, the RuntimeCallStats system is the replacement tool for
investigating performance issues related to IC misses.

This effectively reverts 1f8adc15 / r21736.

Review-Url: https://codereview.chromium.org/2480343002
Cr-Commit-Position: refs/heads/master@{#40893}