swift234

Teach name lookup to shadow factory-method-imported constructors with init-method-imported ones.

There is no way to avoid having both the factory-method-imported
constructor and the init-method-imported constructor show up in the
AST (which could happen in the REPL when subsequent modules are
loaded), so cope with the problem directly. Still, we can do somewhat
better here if we can suppress redundant declarations in the general
case and use "available" in the uncommon case.


Swift SVN r16495