Add a test for b/62688874.

The crash in that bug showed we could also leak references with
garbage (0xEBADDE09), because mterp uses the same code between
RETURN and RETURN_OBJECT.

bug: 62688874
bug: 62536525
Test: 656-loop-deopt
Change-Id: Ic54009a505dc6e845f5d6c8fedcfe8c10783023c