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)
@@ -1146,10 +1146,12 @@
 class HInvokeInterceptor extends HInvokeStatic {
   final SourceString name;
   final bool getter;
+  final bool setter;
 
   HInvokeInterceptor(Selector selector,
                      SourceString this.name,
                      bool this.getter,

[floitsch, 2012/05/07 13:58:32]

Since named arguments don't cost anything on constructors I would prefer that.
Alternatively I'm ok with:
bool isGetter = true;
bool isSetter = false;
new HInvokeInterceptor(..., isGetter, isSetter, ...)
at the call-site.

[ngeoffray, 2012/05/08 07:43:46]

Added named parameters.

+                     bool this.setter,
                      List<HInstruction> inputs,
                      [HType knownType = HType.UNKNOWN])
       : super(selector, inputs, knownType);