Since now all phases have the same order (or the reverse) we can share
only one container that would specify the traversal order.

We still need a queue that will be used for revisiting purposes in
PROPAGATE and RETYPE.

Bug: v8:10424
Change-Id: Iab1e3c3cf6ffd342240d43be3b8ac77812aff211
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2154201
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Reviewed-by: Nico Hartmann <nicohartmann@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68008}