Delay entrypoint update until visibly initialized.

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: Idde0cbc848f19236319426bc82ac10b8b8bb9ee9
4 files changed