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Instead of going back and forth from stub code to C++, perform only the lookup in C++ and call target functions only from stub code. noSuchMethod and implicit closure invocations are now also work with the megamorphic cache. Before they would go slow-case in the megamorphic case. This CL eliminates the InstanceFunctionLookup stub that was previously used to handle noSuchMethod and implicit closure invocations. R=srdjan@google.com Review URL: https://codereview.chromium.org//221173011 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@34774 260f80e4-7a28-3924-810f-c04153c831b5