The HandleScope lets objects allocated within the slow loop be collected
prior to loop termination.

Drive-by: Use the appropriate kMaxElementCount constant.
Drive-by: Switch to less-or-equal comparison against it.

Bug: chromium:948810
Change-Id: I2449408b87e7e82dead5ee76d8c92129fa3243fc
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1736749
Auto-Submit: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63103}