Remove dangerous default parameter from machine Store operator.

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/compiler/opcodes.h"
 #include "src/compiler/operator.h"
 #include "src/zone.h"
@@ skipping 69 matching lines @@
          Operator::kAssociative | Operator::kCommutative | Operator::kPure, 2, \
          2)
 #define UNOP(name) SIMPLE(name, Operator::kPure, 1, 1)
 
 #define WORD_SIZE(x) return is64() ? Word64##x() : Word32##x()
 
   Operator* Load(MachineRepresentation rep) {  // load [base + index]
     OP1(Load, MachineRepresentation, rep, Operator::kNoWrite, 2, 1);
   }
   // store [base + index], value
-  Operator* Store(MachineRepresentation rep,
-                  WriteBarrierKind kind = kNoWriteBarrier) {
+  Operator* Store(MachineRepresentation rep, WriteBarrierKind kind) {
     StoreRepresentation store_rep = {rep, kind};
     OP1(Store, StoreRepresentation, store_rep, Operator::kNoRead, 3, 0);
   }
 
   Operator* WordAnd() { WORD_SIZE(And); }
   Operator* WordOr() { WORD_SIZE(Or); }
   Operator* WordXor() { WORD_SIZE(Xor); }
   Operator* WordShl() { WORD_SIZE(Shl); }
   Operator* WordShr() { WORD_SIZE(Shr); }
   Operator* WordSar() { WORD_SIZE(Sar); }
@@ skipping 80 matching lines @@
 
  private:
   Zone* zone_;
   MachineRepresentation word_;
 };
 }
 }
 }  // namespace v8::internal::compiler
 
 #endif  // V8_COMPILER_MACHINE_OPERATOR_H_