swift234

Omit needless words: strip result type info from both sides of a zero-argument method.

This takes an highly-redundant API name like NSBezierPath's

  func bezierPathByReversingPath() -> NSBezierPath

and turns it into

  func reversing() -> NSBezierPath

Also, handle 'instancetype' properly when omitting words matching the
result type from the front of the base name.

Swift SVN r32119