[turbofan] Properly delete nodes in the GraphReducer.

src/compiler/compiler.gyp

 # 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.
 
 {
   'variables': {
     'v8_code': 1,
   },
   'includes': ['../../build/toolchain.gypi', '../../build/features.gypi'],
   'targets': [
     {
       'target_name': 'compiler-unittests',
       'type': 'executable',
       'dependencies': [
         '../test/test.gyp:run-all-unittests',
       ],
       'include_dirs': [
         '../..',
       ],
       'sources': [  ### gcmole(all) ###
         'change-lowering-unittest.cc',
         'common-operator-unittest.cc',
         'compiler-test-utils.h',
+        'graph-reducer-unittest.cc',
         'graph-unittest.cc',
         'graph-unittest.h',
         'instruction-selector-unittest.cc',
         'instruction-selector-unittest.h',
         'machine-operator-reducer-unittest.cc',
         'machine-operator-unittest.cc',
         'simplified-operator-reducer-unittest.cc',
       ],
       'conditions': [
         ['v8_target_arch=="arm"', {
@@ skipping 13 matching lines @@
         }],
         ['v8_target_arch=="x64"', {
           'sources': [  ### gcmole(arch:x64) ###
             'x64/instruction-selector-x64-unittest.cc',
           ],
         }],
       ],
     },
   ],
 }