Remove parallel marking support.

src/v8.cc

 // 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 209 matching lines @@
               SystemThreadManager::PARALLEL_SWEEPING);
     }
     if (FLAG_sweeper_threads == 0) {
       FLAG_concurrent_sweeping = false;
       FLAG_parallel_sweeping = false;
     }
   } else if (!FLAG_concurrent_sweeping && !FLAG_parallel_sweeping) {
     FLAG_sweeper_threads = 0;
   }
 
-  if (FLAG_parallel_marking) {
-    if (FLAG_marking_threads <= 0) {
-      FLAG_marking_threads = SystemThreadManager::
-          NumberOfParallelSystemThreads(
-              SystemThreadManager::PARALLEL_MARKING);
-    }
-    if (FLAG_marking_threads == 0) {
-      FLAG_parallel_marking = false;
-    }
-  } else {
-    FLAG_marking_threads = 0;
-  }
-
   if (FLAG_concurrent_recompilation &&
       SystemThreadManager::NumberOfParallelSystemThreads(
           SystemThreadManager::PARALLEL_RECOMPILATION) == 0) {
     FLAG_concurrent_recompilation = false;
   }
 
   Sampler::SetUp();
   CPU::SetUp();
   OS::PostSetUp();
   ElementsAccessor::InitializeOncePerProcess();
   LOperand::SetUpCaches();
   SetUpJSCallerSavedCodeData();
   ExternalReference::SetUp();
   Bootstrapper::InitializeOncePerProcess();
 }
 
 
 void V8::InitializeOncePerProcess() {
   CallOnce(&init_once, &InitializeOncePerProcessImpl);
 }
 
 } }  // namespace v8::internal