Change-Id: Ib36b6e27476f7cc1e2064e147fbfa7d3d1e28b49

These will be used in subsequent CLs to add spec-compliant builtins
on Array.prototype built with the CSA.

Change-Id: Ib36b6e27476f7cc1e2064e147fbfa7d3d1e28b49
Reviewed-on: https://chromium-review.googlesource.com/700694
Commit-Queue: Daniel Clifford <danno@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48306}