Move a definition to fix a compiler error

runtime/vm/kernel.cc

 // Copyright (c) 2016, 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/kernel.h"
 
 #if !defined(DART_PRECOMPILED_RUNTIME)
 namespace dart {
 
 namespace kernel {
@@ skipping 225 matching lines @@
 
 
 void LocalInitializer::VisitChildren(Visitor* visitor) {
   visitor->VisitVariableDeclaration(variable());
 }
 
 
 FunctionNode::~FunctionNode() {}
 
 
+void FunctionNode::ReplaceBody(Statement* body) {
+  delete body_;
+  // Use static_cast to invoke the conversion function and so avoid triggering
+  // ASSERT(pointer_ == NULL) in operator= when overwriting a non-NULL body.
+  static_cast<Statement*&>(body_) = body;
+}
+
+
 void FunctionNode::AcceptTreeVisitor(TreeVisitor* visitor) {
   visitor->VisitFunctionNode(this);
 }
 
 
 void FunctionNode::VisitChildren(Visitor* visitor) {
   VisitList(&type_parameters(), visitor);
   VisitList(&positional_parameters(), visitor);
   VisitList(&named_parameters(), visitor);
   if (return_type() != NULL) return_type()->AcceptDartTypeVisitor(visitor);
@@ skipping 1019 matching lines @@
 
 void Program::VisitChildren(Visitor* visitor) {
   VisitList(&libraries(), visitor);
 }
 
 
 }  // namespace kernel
 
 }  // namespace dart
 #endif  // !defined(DART_PRECOMPILED_RUNTIME)