[strong] Refactor ObjectStrength into a replacement for strong boolean args

src/compiler/js-typed-lowering.cc

 // 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.
 
 #include "src/code-factory.h"
 #include "src/compiler/access-builder.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/js-typed-lowering.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 175 matching lines @@
       value->ReplaceInput(0, node_);
       return lowering_->Replace(value);
     }
     return lowering_->Changed(node_);
   }
 
   Reduction ChangeToPureOperator(const Operator* op, Type* type) {
     return ChangeToPureOperator(op, false, type);
   }
 
-  bool IsStrong() { return is_strong(OpParameter<LanguageMode>(node_)); }
+  bool IsStrong() { return is_strong(OpParameter<Strength>(node_)); }
 
   bool OneInputIs(Type* t) { return left_type()->Is(t) || right_type()->Is(t); }
 
   bool BothInputsAre(Type* t) {
     return left_type()->Is(t) && right_type()->Is(t);
   }
 
   bool OneInputCannotBe(Type* t) {
     return !left_type()->Maybe(t) || !right_type()->Maybe(t);
   }
@@ skipping 1345 matching lines @@
 }
 
 
 MachineOperatorBuilder* JSTypedLowering::machine() const {
   return jsgraph()->machine();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8