dex2oat: Avoid unnecessary field/method resolution.

There is no reason to resolve fields and methods of a class
we have just resolved, so remove that code. Refactor type
resolution and avoid resolving classes twice for boot image.

Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing
Bug: 181943478
Change-Id: I01f182a5fdfd000819fa9d9b8926d5cb320c1e0c