This ensure that all inline allocations generated by {JSCreateLowering}
will fit into a regular heap page. Allocations targeting LO-space must
be done via a slower runtime call.

R=bmeurer@chromium.org
BUG=chromium:669850

Review-Url: https://codereview.chromium.org/2533353003
Cr-Commit-Position: refs/heads/master@{#41412}