Address Peter's comments on the new parameter specification implementation.

lib/compiler/implementation/ssa/builder.dart

Index: lib/compiler/implementation/ssa/builder.dart
===================================================================
--- lib/compiler/implementation/ssa/builder.dart	(revision 12495)
+++ lib/compiler/implementation/ssa/builder.dart	(working copy)
@@ -2445,8 +2445,8 @@
           'More than one expression in JS_HAS_EQUALS()', node: node);
     }
     addGenericSendArgumentsToList(node.arguments, inputs);
-    String name =
-        backend.namer.instanceMethodNameByArity(Elements.OPERATOR_EQUALS, 1);
+    String name = backend.namer.publicInstanceMethodNameByArity(
+        Elements.OPERATOR_EQUALS, 1);
     push(new HForeign(new DartString.literal('!!#.$name'),
                       const LiteralDartString('bool'),
                       inputs));