This bug improves performance of escape analysis.

* A allocation discovery phase  (EscapeAnalysis::AssignAliases)
  ensures compact representation of virtual state
* Node revisiting in EscapeStatusAnalysis has been improved
* Escape analysis no longer requires a trimmed graph

BUG=v8:4586
LOG=n

Review URL: https://codereview.chromium.org/1559123003

Cr-Commit-Position: refs/heads/master@{#33267}