swift234

[ClangImporter] Don't even try to import methods with C-style parameters.

  + (void)doThing:(int)a, int b, int c
  [Foo doThing:0, 1, 2];

This style is deprecated and no one uses it for anything but variadics now.
Previously we would just crash.

r28979 made this crash even earlier, so fixing as part of
rdar://problem/19240897

Swift SVN r28989