Revert^4 "Allow structural redefinition on non-final classes."

This reverts commit 664999a12d6fc8a8ef5c0519b12ec1e8a51bb085.

Fixed issues with GC and quickened instructions in parent CLs.

Reason for revert: Fixed issues with GC CHECK fail and device SEGVs.

Test: ./test.py --host
Test: ./test.py --target
Bug: 134162467
Bug: 144168550
Change-Id: Ibacddaf45beb72184f97d53d5d048bd442578658
47 files changed