dart2js cps: Cleanup.

pkg/compiler/lib/src/tree_ir/tree_ir_nodes.dart

Index: pkg/compiler/lib/src/tree_ir/tree_ir_nodes.dart
diff --git a/pkg/compiler/lib/src/tree_ir/tree_ir_nodes.dart b/pkg/compiler/lib/src/tree_ir/tree_ir_nodes.dart
index ab549e23cc78497dbbc689dc27be4f4a0b48bf38..b30c36809ca132d127ff8c6971266c3e788f6a10 100644
--- a/pkg/compiler/lib/src/tree_ir/tree_ir_nodes.dart
+++ b/pkg/compiler/lib/src/tree_ir/tree_ir_nodes.dart
@@ -181,16 +181,8 @@ class InvokeStatic extends Expression implements Invoke {
   final Selector selector;
   final SourceInformation sourceInformation;
 
-  /// True if the [target] is known not to diverge or read or write any
-  /// mutable state.
-  ///
-  /// This is set for calls to `getInterceptor` and `identical` to indicate
-  /// that they can be safely be moved across an impure expression
-  /// (assuming the [arguments] are not affected by the impure expression).
-  bool isEffectivelyConstant = false;
-
   InvokeStatic(this.target, this.selector, this.arguments,
-               {this.sourceInformation});
+               [this.sourceInformation]);
 
   accept(ExpressionVisitor visitor) => visitor.visitInvokeStatic(this);
   accept1(ExpressionVisitor1 visitor, arg) {