[turbofan] Limit the load/store machine types to the ones we actually use.

src/compiler/machine-operator.h

 // Copyright 2013 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_MACHINE_OPERATOR_H_
 #define V8_COMPILER_MACHINE_OPERATOR_H_
 
 #include "src/base/flags.h"
 #include "src/compiler/machine-type.h"
 
@@ skipping 279 matching lines @@
   V(Uint, Mod)
 #define PSEUDO_OP(Prefix, Suffix)                                \
   const Operator* Prefix##Suffix() {                             \
     return Is32() ? Prefix##32##Suffix() : Prefix##64##Suffix(); \
   }
   PSEUDO_OP_LIST(PSEUDO_OP)
 #undef PSEUDO_OP
 #undef PSEUDO_OP_LIST
 
  private:
-  Zone* const zone_;
   MachineOperatorGlobalCache const& cache_;
   MachineType const word_;
   Flags const flags_;
 
   DISALLOW_COPY_AND_ASSIGN(MachineOperatorBuilder);
 };
 
 
 DEFINE_OPERATORS_FOR_FLAGS(MachineOperatorBuilder::Flags)
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_MACHINE_OPERATOR_H_