Change well-known `DdmServer` methods to `ArtMethod*`.

Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing --interpreter
Test: run-libjdwp-tests.sh --mode=device --variant=X32 --debug
Change-Id: I31c61424a81037a20d4a6bceb081915da067d87f
6 files changed