Introduce simplified BooleanToNumber operator.

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/compiler/access-builder.h"
 #include "src/compiler/graph-inl.h"
 #include "src/compiler/js-typed-lowering.h"
 #include "src/compiler/node-aux-data-inl.h"
 #include "src/compiler/node-properties-inl.h"
 #include "src/types.h"
@@ skipping 426 matching lines @@
     return Changed(input);
   }
   if (input_type->Is(Type::Undefined())) {
     // JSToNumber(undefined) => #NaN
     return ReplaceWith(jsgraph()->NaNConstant());
   }
   if (input_type->Is(Type::Null())) {
     // JSToNumber(null) => #0
     return ReplaceWith(jsgraph()->ZeroConstant());
   }
-  // TODO(turbofan): js-typed-lowering of ToNumber(x:boolean)
+  if (input_type->Is(Type::Boolean())) {
+    // JSToNumber(x:boolean) => BooleanToNumber(x)
+    return ReplaceWith(
+        graph()->NewNode(simplified()->BooleanToNumber(), input));
+  }
   // TODO(turbofan): js-typed-lowering of ToNumber(x:string)
   return NoChange();
 }
 
 
 Reduction JSTypedLowering::ReduceJSToStringInput(Node* input) {
   if (input->opcode() == IrOpcode::kJSToString) {
     // Recursively try to reduce the input first.
     Reduction result = ReduceJSToStringInput(input->InputAt(0));
     if (result.Changed()) {
@@ skipping 218 matching lines @@
       return ReduceJSStoreProperty(node);
     default:
       break;
   }
   return NoChange();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8