Fix regression on constant folding an interceptor into a dynamic invocation.

lib/compiler/implementation/ssa/nodes.dart

Index: lib/compiler/implementation/ssa/nodes.dart
===================================================================
--- lib/compiler/implementation/ssa/nodes.dart	(revision 7375)
+++ lib/compiler/implementation/ssa/nodes.dart	(working copy)
@@ -1146,12 +1146,14 @@
 class HInvokeInterceptor extends HInvokeStatic {
   final SourceString name;
   final bool getter;
+  final bool setter;
 
   HInvokeInterceptor(Selector selector,
                      SourceString this.name,
-                     bool this.getter,
                      List<HInstruction> inputs,
-                     [HType knownType = HType.UNKNOWN])
+                     [HType knownType = HType.UNKNOWN,
+                      bool this.getter = false,
+                      bool this.setter = false])
       : super(selector, inputs, knownType);
 
   toString() => 'invoke interceptor: ${element.name}';