Fix issue http://code.google.com/p/dart/issues/detail?id=3627 do not generate a 'var' for variables…

lib/compiler/implementation/ssa/codegen.dart

Index: lib/compiler/implementation/ssa/codegen.dart
===================================================================
--- lib/compiler/implementation/ssa/codegen.dart	(revision 8641)
+++ lib/compiler/implementation/ssa/codegen.dart	(working copy)
@@ -224,6 +224,9 @@
     equalsNullElement = interceptors.getEqualsNullInterceptor();
     boolifiedEqualsNullElement =
         interceptors.getBoolifiedVersionOf(equalsNullElement);
+    parameterNames.forEach((Element element, String name) {
+      declaredVariables.add(name);
+    });
   }
 
   abstract visitTypeGuard(HTypeGuard node);