[PATCH] Abstract out virtual calls and virtual function prologue code generation

[Timur Iskhodzhanov]

  > Should I fix the style in the lines I touch anyways?

  Like, if in doubt - can I just rely on clang-format being right here?

  FTR, it formats like this:

    a =
        longvalue;

http://llvm-reviews.chandlerc.com/D1260