swift234

Fix the rest of <rdar://problem/20409366> Diagnostics for init calls should print the class name

Now for:
let req = NSURLRequest(URL: NSURL(string: "<some url>")!)?

instead of producing:
test.swift:2:58: error: could not find an overload for 'init' that accepts the supplied 

we produce the correct diagnostic, with a fixit:

error: cannot use optional chaining on non-optional value of type 'NSURLRequest'
let req = NSURLRequest(URL: NSURL(string: "<some url>")!)?
          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^

This also consolidates some existing diagnostics to improve their wording.



Swift SVN r30049