Replace OS::NumberOfCores() with CPU::NumberOfProcessorsOnline().

src/isolate.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 119 matching lines @@
 }
 
 
 v8::TryCatch* ThreadLocalTop::TryCatchHandler() {
   return TRY_CATCH_FROM_ADDRESS(try_catch_handler_address());
 }
 
 
 int SystemThreadManager::NumberOfParallelSystemThreads(
     ParallelSystemComponent type) {
-  int number_of_threads = Min(OS::NumberOfCores(), kMaxThreads);
+  int number_of_threads = Min(CPU::NumberOfProcessorsOnline(), kMaxThreads);
   ASSERT(number_of_threads > 0);
   if (number_of_threads ==  1) {
     return 0;
   }
   if (type == PARALLEL_SWEEPING) {
     return number_of_threads;
   } else if (type == CONCURRENT_SWEEPING) {
     return number_of_threads - 1;
   } else if (type == PARALLEL_MARKING) {
     return number_of_threads;
@@ skipping 2373 matching lines @@
 
 #ifdef DEBUG
 #define ISOLATE_FIELD_OFFSET(type, name, ignored)                       \
 const intptr_t Isolate::name##_debug_offset_ = OFFSET_OF(Isolate, name##_);
 ISOLATE_INIT_LIST(ISOLATE_FIELD_OFFSET)
 ISOLATE_INIT_ARRAY_LIST(ISOLATE_FIELD_OFFSET)
 #undef ISOLATE_FIELD_OFFSET
 #endif
 
 } }  // namespace v8::internal