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This commit starts the process of adding default methods and their
associated pieces to ART.

This adds full support for calling default methods using
invoke-interface and invoke-virtual on objects implementing the
interfaces. Verifier is changed to allow this when the runtime is
started with -Xexperimental:default-methods.

This also adds support for defining and calling static methods on
interface classes with invoke-static.

Directly calling overridden default methods using invoke-super is not
yet supported.

This adds 5 new run-tests for this functionality.

Bug: 24618811

Change-Id: I35ca800d99d3329348b277789b70ceeeba6e7f03