Make compaction happen after freezing

Make compaction happen after a process has been frozen which reduces
compaction overtriggering and reduces unwanted decompressions caused
by apps that are not yet frozen and makes the flow more maintainable.

Bug: 274013197
Test: am freeze <process>
Change-Id: I677af7bffb4d4bfbf9321b2e00852dfb699466a7