[turbofan] Hide dangerous RawMachineAssembler accessors.

src/compiler/interpreter-assembler.h

 // 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.
 
 #ifndef V8_COMPILER_INTERPRETER_ASSEMBLER_H_
 #define V8_COMPILER_INTERPRETER_ASSEMBLER_H_
 
 // Clients of this interface shouldn't depend on lots of compiler internals.
 // Do not include anything from src/compiler here!
 #include "src/allocation.h"
@@ skipping 178 matching lines @@
   void DispatchTo(Node* new_bytecode_offset);
 
   // Abort operations for debug code.
   void AbortIfWordNotEqual(Node* lhs, Node* rhs, BailoutReason bailout_reason);
 
   // Adds an end node of the graph.
   void AddEndInput(Node* input);
 
   // Private helpers which delegate to RawMachineAssembler.
   Isolate* isolate();
-  Schedule* schedule();
   Zone* zone();
 
   interpreter::Bytecode bytecode_;
   base::SmartPointer<RawMachineAssembler> raw_assembler_;
   ZoneVector<Node*> end_nodes_;
   Node* accumulator_;
   Node* context_;
   bool code_generated_;
 
   DISALLOW_COPY_AND_ASSIGN(InterpreterAssembler);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_INTERPRETER_ASSEMBLER_H_