It looks like waiting for 4 ticks before optimizing from interpreted
code is hurting performance in sunspider after turning on Ignition
for all TurboFan code. Set it back to 2 ticks.

BUG=chromium:661556

Review-Url: https://codereview.chromium.org/2488703002
Cr-Commit-Position: refs/heads/master@{#40845}