Installd: Separate profile merging and compilation

Create a new merge_profiles command to check and merge profiles.

(Almost) always pass a profile to a dexopt pass.

Require compilation filter input to dexopt and use it for dex2oat
(except for hard overrides like safe-mode).

Bug: 27689078
Change-Id: I1257857cc15c17e2271d1261ea4cc80752270fcb