Step 2 of 2: conditional passes.

Rationale:
The change introduces actual conditional passes
(dependence on inliner). This ensures more
cases are optimized downstream without
needlessly introducing compile-time.

NOTE:
Some checker tests needed to be rewritten
due to subtle changes in the phase ordering.
No optimizations were harmed in the process,
though.

Bug: b/78171933, b/74026074

Test: test-art-host,target

Change-Id: I335260df780e14ba1f22499ad74d79060c7be44d