Design doc:
https://docs.google.com/document/d/1vCQYhtFPqXafSMweSnGD8l0TKEIB6cPV5UGMHJtpy8k/edit?ts=5bf7d341

This CL only introduces a skeleton of the new phase that implements a bytecode
walker. The SUPPORTED_BYTECODE_LIST is supposed to be filled in gradually.

Bug:v8:7790

R=jarin@chromium.org, neis@chromium.org

Change-Id: I57fea91c55dca888581f2490bdf7b831fc61eda4
Reviewed-on: https://chromium-review.googlesource.com/c/1386872Reviewed-by: Georg Neis <neis@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Maya Lekova <mslekova@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58582}