Replace start_env with initial_definitions in GraphEntryInstr.

runtime/vm/intermediate_language.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_INTERMEDIATE_LANGUAGE_H_
 #define VM_INTERMEDIATE_LANGUAGE_H_
 
 #include "vm/allocation.h"
 #include "vm/ast.h"
 #include "vm/growable_array.h"
@@ skipping 781 matching lines @@
       GrowableArray<BlockEntryInstr*>* postorder,
       GrowableArray<intptr_t>* parent,
       GrowableArray<BitVector*>* assigned_vars,
       intptr_t variable_count,
       intptr_t fixed_parameter_count);
 
   void AddCatchEntry(TargetEntryInstr* entry) { catch_entries_.Add(entry); }
 
   virtual void PrepareEntry(FlowGraphCompiler* compiler);
 
-  Environment* start_env() const { return start_env_; }
-  void set_start_env(Environment* env) { start_env_ = env; }
-
-  ConstantInstr* constant_null() const { return constant_null_; }
-  void set_constant_null(ConstantInstr* instr) { constant_null_ = instr; }
+  GrowableArray<Definition*>& initial_definitions() {
+    return initial_definitions_;
+  }
+  ConstantInstr* constant_null();
 
   intptr_t spill_slot_count() const { return spill_slot_count_; }
   void set_spill_slot_count(intptr_t count) {
     ASSERT(count >= 0);
     spill_slot_count_ = count;
   }
 
   TargetEntryInstr* normal_entry() const { return normal_entry_; }
 
   virtual void PrintTo(BufferFormatter* f) const;
   virtual void PrintToVisualizer(BufferFormatter* f) const;
 
  private:
   TargetEntryInstr* normal_entry_;
   GrowableArray<TargetEntryInstr*> catch_entries_;
-  Environment* start_env_;
-  ConstantInstr* constant_null_;
+  GrowableArray<Definition*> initial_definitions_;
   intptr_t spill_slot_count_;
 
   DISALLOW_COPY_AND_ASSIGN(GraphEntryInstr);
 };
 
 
 class JoinEntryInstr : public BlockEntryInstr {
  public:
   explicit JoinEntryInstr(intptr_t try_index)
       : BlockEntryInstr(try_index),
@@ skipping 2834 matching lines @@
   ForwardInstructionIterator* current_iterator_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(FlowGraphVisitor);
 };
 
 
 }  // namespace dart
 
 #endif  // VM_INTERMEDIATE_LANGUAGE_H_