Fix a bug where we would emit a noSuchMethod handler in the Object class for Object methods because…

sdk/lib/_internal/compiler/implementation/types/type_mask.dart

Index: sdk/lib/_internal/compiler/implementation/types/type_mask.dart
===================================================================
--- sdk/lib/_internal/compiler/implementation/types/type_mask.dart	(revision 26305)
+++ sdk/lib/_internal/compiler/implementation/types/type_mask.dart	(working copy)
@@ -104,6 +104,12 @@
   bool willHit(Selector selector, Compiler compiler);
 
   /**
+   * Returns whether this [TypeMask] applied to [selector] can hit a
+   * [noSuchMethod].
+   */
+  bool needsNoSuchMethodHandling(Selector selector, Compiler compiler);
+
+  /**
    * Returns whether [element] is a potential target when being
    * invoked on this type mask. [selector] is used to ensure library
    * privacy is taken into account.