Add the ObjFW runtime.  Patch by Jonathan Schleifer!

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@160102 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Basic/ObjCRuntime.cpp b/lib/Basic/ObjCRuntime.cpp
index f52677b..9bd433a 100644
--- a/lib/Basic/ObjCRuntime.cpp
+++ b/lib/Basic/ObjCRuntime.cpp
@@ -32,6 +32,7 @@
   case ObjCRuntime::iOS: out << "ios"; break;
   case ObjCRuntime::GNUstep: out << "gnustep"; break;
   case ObjCRuntime::GCC: out << "gcc"; break;
+  case ObjCRuntime::ObjFW: out << "objfw"; break;
   }
   if (value.getVersion() > VersionTuple(0)) {
     out << '-' << value.getVersion();
@@ -68,6 +69,8 @@
     kind = ObjCRuntime::GNUstep;
   } else if (runtimeName == "gcc") {
     kind = ObjCRuntime::GCC;
+  } else if (runtimeName == "objfw") {
+    kind = ObjCRuntime::ObjFW;
   } else {
     return true;
   }