Implement parallel pointer updates after evacuation.

tools/gyp/v8.gyp

 # Copyright 2012 the V8 project authors. All rights reserved.
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 # modification, are permitted provided that the following conditions are
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 #
 #     * Redistributions of source code must retain the above copyright
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@@ skipping 874 matching lines @@
         '../../src/heap/incremental-marking.cc',
         '../../src/heap/incremental-marking.h',
         '../../src/heap/mark-compact-inl.h',
         '../../src/heap/mark-compact.cc',
         '../../src/heap/mark-compact.h',
         '../../src/heap/object-stats.cc',
         '../../src/heap/object-stats.h',
         '../../src/heap/objects-visiting-inl.h',
         '../../src/heap/objects-visiting.cc',
         '../../src/heap/objects-visiting.h',
+        '../../src/heap/page-parallel-job.h',
         '../../src/heap/remembered-set.cc',
         '../../src/heap/remembered-set.h',
         '../../src/heap/scavenge-job.h',
         '../../src/heap/scavenge-job.cc',
         '../../src/heap/scavenger-inl.h',
         '../../src/heap/scavenger.cc',
         '../../src/heap/scavenger.h',
         '../../src/heap/slot-set.h',
         '../../src/heap/spaces-inl.h',
         '../../src/heap/spaces.cc',
@@ skipping 1360 matching lines @@
         }],
         ['want_separate_host_toolset==1', {
           'toolsets': ['host'],
         }, {
           'toolsets': ['target'],
         }],
       ],
     },
   ],
 }