swift234

Clang importer: add a hardwired table mapping selectors to method names.

Regardless of the heuristic we choose when importing Objective-C
selectors into Swift method names, there will be poor cases. Allow us
to bake specific mappings into the compiler so we can address those
cases without having to modify the Objective-C headers.

Part of <rdar://problem/16341485>.


Swift SVN r15984