swift234

clean up Builtins.def:
 - Don't require "OverloadedBuiltinKind::" to be in the invocation
   of a bunch of builtins for their specification of overload info.
   Eliminating this makes the file fit in 80 columns.
 - Eliminate a bunch of classifications that only classify one thing,
   in favor of a "BUILTIN_MISC_OPERATION" dumping ground for all the
   custom stuff.  This eliminates a bunch of boilerplate.

No functionality change.


Swift SVN r3615