Replace more ENTER_V8 invocations

Also make the macro name more scary, so people don't add new calls

BUG=v8:5830
R=jgruber@chromium.org

Change-Id: I06760110b7f0429d7775345b414c75c8df5e503a
Reviewed-on: https://chromium-review.googlesource.com/497451Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Jochen Eisinger <jochen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45154}