Clean up initialization checks for entrypoints.

Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing --jit
Test: aosp_taimen-userdebug boots.
Test: run-gtests.sh
Test: testrunner.py --target --optimizing --jit
Bug: 18161648
Change-Id: Ia3c2fdb616a5bb289e5afeccd4e6fe3eaf7ed697
9 files changed