Screw around with ObjCRuntime some more, changing the
diagnostics for bad deployment targets and adding a few
more predicates.  Includes a patch by Jonathan Schleifer
to enable ARC for ObjFW.

llvm-svn: 162252
diff --git a/clang/lib/ARCMigrate/Transforms.cpp b/clang/lib/ARCMigrate/Transforms.cpp
index 1175c36..f01dfa9 100644
--- a/clang/lib/ARCMigrate/Transforms.cpp
+++ b/clang/lib/ARCMigrate/Transforms.cpp
@@ -40,7 +40,7 @@
 
 bool trans::canApplyWeak(ASTContext &Ctx, QualType type,
                          bool AllowOnUnknownClass) {
-  if (!Ctx.getLangOpts().ObjCRuntimeHasWeak)
+  if (!Ctx.getLangOpts().ObjCARCWeak)
     return false;
 
   QualType T = type;