Replace start_env with initial_definitions in GraphEntryInstr.

runtime/vm/intermediate_language.cc

 // 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.
 
 #include "vm/intermediate_language.h"
 
 #include "vm/bit_vector.h"
 #include "vm/dart_entry.h"
 #include "vm/flow_graph_allocator.h"
 #include "vm/flow_graph_builder.h"
@@ skipping 120 matching lines @@
   ConstantInstr* constant = definition()->AsConstant();
   ASSERT(constant != NULL);
   return constant->value();
 }
 
 
 GraphEntryInstr::GraphEntryInstr(TargetEntryInstr* normal_entry)
     : BlockEntryInstr(CatchClauseNode::kInvalidTryIndex),
       normal_entry_(normal_entry),
       catch_entries_(),
-      start_env_(NULL),
-      constant_null_(NULL),
+      initial_definitions_(),
       spill_slot_count_(0) {
 }
 
 
+ConstantInstr* GraphEntryInstr::constant_null() {
+  ASSERT(initial_definitions_.length() > 0 &&
+         initial_definitions_[0]->IsConstant() &&
+         initial_definitions_[0]->AsConstant()->value().IsNull());
+  return initial_definitions_[0]->AsConstant();
+}
+
+
 static bool CompareNames(const Library& lib,
                          const char* test_name,
                          const String& name) {
   // If both names are private mangle test_name before comparison.
   if ((name.CharAt(0) == '_') && (test_name[0] == '_')) {
     const String& test_name_symbol = String::Handle(Symbols::New(test_name));
     return String::Handle(lib.PrivateName(test_name_symbol)).Equals(name);
   }
   return name.Equals(test_name);
 }
@@ skipping 1591 matching lines @@
     value->set_use_index(use_index++);
     value->AddToEnvUseList();
   }
   instr->env()->outer_ = copy;
 }
 
 
 #undef __
 
 }  // namespace dart