[turbofan] Hide dangerous RawMachineAssembler accessors.

src/compiler/interpreter-assembler.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/interpreter-assembler.h"
 
 #include <ostream>
 
 #include "src/code-factory.h"
 #include "src/compiler/graph.h"
@@ skipping 635 matching lines @@
 
 
 Graph* InterpreterAssembler::graph() { return raw_assembler_->graph(); }
 
 
 CallDescriptor* InterpreterAssembler::call_descriptor() const {
   return raw_assembler_->call_descriptor();
 }
 
 
-Schedule* InterpreterAssembler::schedule() {
-  return raw_assembler_->schedule();
-}
-
-
 Zone* InterpreterAssembler::zone() { return raw_assembler_->zone(); }
 
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8