Introduce subclass wrappers for STL containers that make them a lot easier

src/compiler/raw-machine-assembler.h

 // Copyright 2014 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_RAW_MACHINE_ASSEMBLER_H_
 #define V8_COMPILER_RAW_MACHINE_ASSEMBLER_H_
 
 #include "src/v8.h"
 
 #include "src/compiler/common-operator.h"
@@ skipping 90 matching lines @@
     return schedule_;
   }
 
  private:
   bool ScheduleValid() { return schedule_ != NULL; }
 
   BasicBlock* Use(Label* label);
   BasicBlock* EnsureBlock(Label* label);
   BasicBlock* CurrentBlock();
 
-  typedef std::vector<MachineType, zone_allocator<MachineType> >
-      RepresentationVector;
-
   Schedule* schedule_;
   MachineOperatorBuilder machine_;
   CommonOperatorBuilder common_;
   MachineCallDescriptorBuilder* call_descriptor_builder_;
   Node** parameters_;
   Label exit_label_;
   BasicBlock* current_block_;
 
   DISALLOW_COPY_AND_ASSIGN(RawMachineAssembler);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_RAW_MACHINE_ASSEMBLER_H_