Don't use the compiler driver for method resolution.

The compiler driver makes assumptions that don't hold for
the optimizing compiler, and will for example always go to
slow path for an invoke-super when there's no verified method.

Also fix GenerateInvokeVirtual in the presence of intrinsics.

Next change will address some of the TODOs in sharpening.cc.

Change-Id: I2b0e543ee9b9bebcadb2d26de29e850c59ad58b9