Revert "Put queued compilations in sets."

This reverts commit 123c02bb75e1ddfb8d20bbd6e2e7c62ee64d6772.

Bug: 218444629

Reason for revert: Some tests are failing.

Change-Id: I0b3bc9b169c2264430e09bdfa79c23d01033827b
5 files changed