Fix moving GC bugs in entrypoints

In FindMethodFromCode, there was missing handles for objects used
after a suspend point (ResolveType).

For check_jni, JniMethodEndWithReferenceHandleResult did not
handlarize the return value when calling CheckReferenceResult.

For CheckReferenceResult, the argument was not in a handle.

Bug: 31458474
Change-Id: I06617fc63f1fb63d7c13ad4245223a8c54fa4b98
5 files changed