[turbofan] Revive the useful parts of the SimplifiedOperatorReducer.

tools/gyp/v8.gyp

 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 548 matching lines @@
         '../../src/compiler/register-configuration.h',
         '../../src/compiler/representation-change.h',
         '../../src/compiler/schedule.cc',
         '../../src/compiler/schedule.h',
         '../../src/compiler/scheduler.cc',
         '../../src/compiler/scheduler.h',
         '../../src/compiler/select-lowering.cc',
         '../../src/compiler/select-lowering.h',
         '../../src/compiler/simplified-lowering.cc',
         '../../src/compiler/simplified-lowering.h',
+        '../../src/compiler/simplified-operator-reducer.cc',
+        '../../src/compiler/simplified-operator-reducer.h',
         '../../src/compiler/simplified-operator.cc',
         '../../src/compiler/simplified-operator.h',
         '../../src/compiler/source-position.cc',
         '../../src/compiler/source-position.h',
         '../../src/compiler/state-values-utils.cc',
         '../../src/compiler/state-values-utils.h',
         '../../src/compiler/tail-call-optimization.cc',
         '../../src/compiler/tail-call-optimization.h',
         '../../src/compiler/typer.cc',
         '../../src/compiler/typer.h',
@@ skipping 1314 matching lines @@
         }],
         ['want_separate_host_toolset==1', {
           'toolsets': ['host'],
         }, {
           'toolsets': ['target'],
         }],
       ],
     },
   ],
 }