Remove invalid assertion in the optimizer

runtime/vm/ast.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_AST_H_
 #define VM_AST_H_
 
 #include "platform/assert.h"
 #include "vm/allocation.h"
 #include "vm/growable_array.h"
@@ skipping 1225 matching lines @@
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(LoadInstanceFieldNode);
 };
 
 
 class StoreInstanceFieldNode : public AstNode {
  public:
   StoreInstanceFieldNode(TokenPosition token_pos,
                          AstNode* instance,
                          const Field& field,
-                         AstNode* value)
+                         AstNode* value,
+                         bool is_initializer)
       : AstNode(token_pos),
         instance_(instance),
         field_(*MayCloneField(field)),
-        value_(value) {
+        value_(value),
+        is_initializer_(is_initializer) {
     ASSERT(instance_ != NULL);
     ASSERT(field_.IsZoneHandle());
     ASSERT(value_ != NULL);
   }
 
   AstNode* instance() const { return instance_; }
   const Field& field() const { return field_; }
   AstNode* value() const { return value_; }
+  bool is_initializer() const { return is_initializer_; }
 
   virtual void VisitChildren(AstNodeVisitor* visitor) const {
     instance()->Visit(visitor);
     value()->Visit(visitor);
   }
 
   DECLARE_COMMON_NODE_FUNCTIONS(StoreInstanceFieldNode);
 
  private:
   AstNode* instance_;
   const Field& field_;
   AstNode* value_;
+  const bool is_initializer_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(StoreInstanceFieldNode);
 };
 
 
 class LoadStaticFieldNode : public AstNode {
  public:
   LoadStaticFieldNode(TokenPosition token_pos, const Field& field)
       : AstNode(token_pos),
         field_(*MayCloneField(field)),
@@ skipping 734 matching lines @@
   const intptr_t try_index_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(InlinedFinallyNode);
 };
 
 }  // namespace dart
 
 #undef DECLARE_COMMON_NODE_FUNCTIONS
 
 #endif  // VM_AST_H_