ObjPtr<>-ify debugger/jdwp.

Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing
Test: run-jdwp-tests.sh --mode=host --variant=X64
Test: run-jdwp-tests.sh --mode=host --variant=X64 --debug
Bug: 31113334
Change-Id: I76889e7c64d7d57ca34236d1b424f00e8e2dda90
7 files changed