The latest OSX 10.9 SDKs have changed name of the ObjC module to ObjectiveC.

Update everywhere in Swift that refers to this module accordingly.

This change is backwards-incompatible and will require rebuilding any
Objective-C-based object files. I recommend a clean of swiftFoundation
and NSStringDemo at the very least. The swiftObjC target is also being
renamed to swiftObjectiveC for consistency.

Swift SVN r3784

tools/swift/Immediate.cpp

@@ -127,7 +127,7 @@ static bool IRGenImportedModules(TranslationUnit *TU,
     StringRef sharedLibName
       = llvm::StringSwitch<StringRef>(SubTU->Name.str())
           .Case("Foundation", "libswiftFoundation.dylib")
-          .Case("ObjC", "libswiftObjC.dylib")
+          .Case("ObjectiveC", "libswiftObjectiveC.dylib")
           .Default("");
     if (!sharedLibName.empty()) {
       loadRuntimeLib(sharedLibName);