Realize IWYU pattern for handles.h header.

src/compiler/simplified-operator.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_COMPILER_SIMPLIFIED_OPERATOR_H_
 #define V8_COMPILER_SIMPLIFIED_OPERATOR_H_
 
 #include <iosfwd>
 
 #include "src/compiler/machine-type.h"
 #include "src/handles.h"
+#include "src/objects.h"
 
 namespace v8 {
 namespace internal {
 
 // Forward declarations.
 template <class>
 class TypeImpl;
 struct ZoneTypeConfig;
 typedef TypeImpl<ZoneTypeConfig> Type;
 class Zone;
@@ skipping 167 matching lines @@
   Zone* const zone_;
 
   DISALLOW_COPY_AND_ASSIGN(SimplifiedOperatorBuilder);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_SIMPLIFIED_OPERATOR_H_