Replace most uses of ZoneList in the parser with ZoneChunkList, which is
more Zone allocation friendly. Includes rewriting some index-based loops
as iterator-based, since ZoneChunkList random access isn't constant
time.

Bug: v8:7754
Change-Id: I49052b8afb90a4f3bfbe4076c2f90505b598e47a
Reviewed-on: https://chromium-review.googlesource.com/1145382Reviewed-by: Marja Hölttä <marja@chromium.org>
Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54631}