With removal of increment operations, each node has a unique id.

runtime/vm/opt_code_generator_ia32.h

Index: runtime/vm/opt_code_generator_ia32.h
===================================================================
--- runtime/vm/opt_code_generator_ia32.h	(revision 7508)
+++ runtime/vm/opt_code_generator_ia32.h	(working copy)
@@ -73,7 +73,6 @@
                                             DeoptReasonId reason_id);
 
   void InlineInstanceGettersWithSameTarget(AstNode* node,
-                                           intptr_t id,
                                            AstNode* receiver,
                                            const String& field_name,
                                            Register recv_reg);
@@ -87,14 +86,12 @@
                     Register right_reg);
 
   void InlineInstanceGetter(AstNode* node,
-                            intptr_t id,
                             AstNode* receiver,
                             const String& field_name,
                             Register recv_reg);
 
   void GenerateInstanceSetter(const InstanceSetterArgs& args);
   void InlineInstanceSetter(AstNode* node,
-                            intptr_t id,
                             AstNode* receiver,
                             const String& field_name,
                             Register recv_reg,
@@ -121,7 +118,6 @@
                           const Array& optional_argument_names);
   void GenerateCheckedInstanceCalls(AstNode* node,
                                     AstNode* receiver,
-                                    intptr_t node_id,
                                     intptr_t token_index,
                                     intptr_t num_args,
                                     const Array& optional_arguments_names);
@@ -149,7 +145,7 @@
   void HandleResult(AstNode* node, Register result_reg);
   void PropagateBackLocalClass(AstNode* node, const Class& cls);
 
-  void PrintCollectedClassesAtId(AstNode* node, intptr_t id);
+  void PrintCollectedClasses(AstNode* node);
   void TraceOpt(AstNode* node, const char* message);
   void TraceNotOpt(AstNode* node, const char* message);