I plan to change the constructor field of maps, and instead of patching
the intrinsics all over the place, just fall back to the runtime.

R=bmeurer@chromium.org
BUG=v8:6084

Change-Id: Ie294b74ab615fd794d7fc47488e2e30e2b49b4db
Reviewed-on: https://chromium-review.googlesource.com/454616Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Jochen Eisinger <jochen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43765}