Use None rather than Optional<T>() where possible.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@175705 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/TreeTransform.h b/lib/Sema/TreeTransform.h
index 0832a24..438d06a 100644
--- a/lib/Sema/TreeTransform.h
+++ b/lib/Sema/TreeTransform.h
@@ -4098,8 +4098,7 @@
                                                   /*ExpectParameterPack=*/true);
       } else {
         NewParm = getDerived().TransformFunctionTypeParam(
-            OldParm, indexAdjustment, Optional<unsigned>(),
-            /*ExpectParameterPack=*/ false);
+            OldParm, indexAdjustment, None, /*ExpectParameterPack=*/ false);
       }
 
       if (!NewParm)
@@ -8565,7 +8564,7 @@
       ArgChanged = true;
 
     ObjCDictionaryElement Element = {
-      Key.get(), Value.get(), SourceLocation(), Optional<unsigned>()
+      Key.get(), Value.get(), SourceLocation(), None
     };
     Elements.push_back(Element);
   }