[stubs] Improve code generation for ToBoolean.

src/factory.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_FACTORY_H_
 #define V8_FACTORY_H_
 
 #include "src/isolate.h"
 #include "src/messages.h"
 #include "src/type-feedback-vector.h"
 
 namespace v8 {
 namespace internal {
 
 enum FunctionMode {
   // With prototype.
   FUNCTION_WITH_WRITEABLE_PROTOTYPE,
   FUNCTION_WITH_READONLY_PROTOTYPE,
   // Without prototype.
   FUNCTION_WITHOUT_PROTOTYPE
 };
 
 // Interface for handle based allocation.
 class Factory final {
  public:
   Handle<Oddball> NewOddball(Handle<Map> map, const char* to_string,
-                             Handle<Object> to_number, bool to_boolean,
-                             const char* type_of, byte kind);
+                             Handle<Object> to_number, const char* type_of,
+                             byte kind);
 
   // Allocates a fixed array initialized with undefined values.
   Handle<FixedArray> NewFixedArray(
       int size,
       PretenureFlag pretenure = NOT_TENURED);
 
   // Allocate a new fixed array with non-existing entries (the hole).
   Handle<FixedArray> NewFixedArrayWithHoles(
       int size,
       PretenureFlag pretenure = NOT_TENURED);
@@ skipping 701 matching lines @@
                                      FunctionMode function_mode);
 
   void SetStrictFunctionInstanceDescriptor(Handle<Map> map,
                                            FunctionMode function_mode);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_FACTORY_H_