This is pre-work to extend the typer phase until after load elinination.

Load elimination uses maps from CheckMaps/MapGuard/CompareMaps/LoadField
and this CL ensures they are brokerized.

Bug: v8:7790
Change-Id: Ic04f9c374bc736f03abf2bc7d257deb268d723c8
Reviewed-on: https://chromium-review.googlesource.com/c/1341950Reviewed-by: Georg Neis <neis@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57628}