With CagedHeapLocalData, size of allocatable area in the caged heap has
reduced, but CL that introduced it didn't change the size passed to
BoundedPageAllocator.

Change-Id: I3720820589c88c3467af68cd7da1b305dc5a77b4
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2297474Reviewed-by: Omer Katz <omerkatz@chromium.org>
Commit-Queue: Anton Bikineev <bikineev@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68862}