There was an eval inside the array_natives_test() which prevented
Crankshaft, even tho it's unrelated, and so we always went to TurboFan
now, which both decreased test coverage and increased time for stress
opt runs.

R=machenbach@chromium.org

Review URL: https://codereview.chromium.org/1725383002

Cr-Commit-Position: refs/heads/master@{#34248}