Use DexManager logic to decide if a package is used by other apps

Stop relying on the file marker recorded by the runtime. We have the
same data available from the DexManager.

The clean up CL to remove the handling of the file markers will follow.

Test: verify that "shared packages" (e.g. gmscore) are not compiled with speed-profile.

Bug: 32871170
Change-Id: I6cc5834ac88489e69896cd5fba9ed9968aa7f5a2