swift234

SILGen: Change the signature of _convertStringToNSString and _convertNSStringToString not to use inouts.

This was an artifact of their long-dead C++-based implementations that was way past due to clean up. It's also a convenient workaround for <rdar://problem/16835447>, since we no longer have to look up constructor members for String at SILGen time and potentially lazily instantiate Clang-imported types during SILGen. This totally isn't a real solution to that problem, but it puts out the fire for now.

Swift SVN r17643