Remove the hashCode function from CPS nodes.

pkg/compiler/lib/src/cps_ir/cps_ir_nodes.dart

Index: pkg/compiler/lib/src/cps_ir/cps_ir_nodes.dart
diff --git a/pkg/compiler/lib/src/cps_ir/cps_ir_nodes.dart b/pkg/compiler/lib/src/cps_ir/cps_ir_nodes.dart
index 3c07fb8c6d49d22662ac17e97bb171ccb12ddda0..960b2eb866407a994ee633a324aad601241434fc 100644
--- a/pkg/compiler/lib/src/cps_ir/cps_ir_nodes.dart
+++ b/pkg/compiler/lib/src/cps_ir/cps_ir_nodes.dart
@@ -14,9 +14,6 @@ import '../universe/universe.dart' show Selector, SelectorKind;
 import '../dart_types.dart' show DartType, GenericType;
 
 abstract class Node {
-  static int hashCount = 0;
-  final int hashCode = hashCount = (hashCount + 1) & 0x3fffffff;
-
   /// A pointer to the parent node. Is null until set by optimization passes.
   Node parent;