Clean up profile tests.

Use TestDexFileBuilder and remove FakeDex. Add a helper
class for shared code between ProfileCompilationInfoTest
and ProfileAssistantTest.

Test: m test-art-host-gtest
Test: run-gtests.sh
Bug: 148067697
Change-Id: I0bf5d3fb7a456dcd717bce694d7f832a654fcccb
12 files changed