Handle potentially const interpolation

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 393 matching lines @@
  public:
   StringInterpolateNode(intptr_t token_pos, ArrayNode* value)
       : AstNode(token_pos), value_(value) { }
 
   virtual void VisitChildren(AstNodeVisitor* visitor) const {
     value_->Visit(visitor);
   }
 
   ArrayNode* value() const { return value_; }
 
+  virtual bool IsPotentiallyConst() const;
+
   DECLARE_COMMON_NODE_FUNCTIONS(StringInterpolateNode);
 
  private:
   ArrayNode* value_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(StringInterpolateNode);
 };
 
 
 class LiteralNode : public AstNode {
@@ skipping 1594 matching lines @@
   const intptr_t try_index_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(InlinedFinallyNode);
 };
 
 }  // namespace dart
 
 #undef DECLARE_COMMON_NODE_FUNCTIONS
 
 #endif  // VM_AST_H_