swift234

Start generating .apinotes files for each of the frameworks that have them.

.apinotes files provide API annotations alongside the Swift overlays
for Objective-C modules, and will be handled by the Clang
importer. Start generating these files from the current in-compiler
source (KnownObjCMethods.def).

The eventual goal is to switch from KnownObjCMethods.def to the
currently-being-defined textual format for API notes, and to replace
the silly swift-ide-test invocations with a Swift driver mode.


Swift SVN r20085