We collect function data for 2 purposes:
- Variable allocation data for lazy parsed functions which contain skippable functions.
- Data needed for creating FunctionLiterals for skippable functions.

In some cases, recompilation happens, and we need to make sure we're not trying
to skip a non-skippable function.

At the moment, we don't collect data for eagerly parsed scopes, since the
assumption is that they'll never get recompiled. (Fixing that will bigger design
changes.)

After this, we're down to 2 failures for mjsunit + --experimental-preparser-scope-analysis.


BUG=v8:5516

Change-Id: I704d488269f6d20a4b14596f2a0acc342ede32cb
Reviewed-on: https://chromium-review.googlesource.com/486802
Commit-Queue: Marja Hölttä <marja@chromium.org>
Reviewed-by: Daniel Vogelheim <vogelheim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44848}