Move NumberOfProcessorsOnline from CPU to OS

src/isolate.cc

 // Copyright 2012 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.
 
 #include <stdlib.h>
 
 #include "v8.h"
 
 #include "ast.h"
 #include "bootstrapper.h"
@@ skipping 1882 matching lines @@
     set_event_logger(Logger::LogInternalEvents);
   } else {
     set_event_logger(Logger::EmptyLogInternalEvents);
   }
 
   // Set default value if not yet set.
   // TODO(yangguo): move this to ResourceConstraints::ConfigureDefaults
   // once ResourceConstraints becomes an argument to the Isolate constructor.
   if (max_available_threads_ < 1) {
     // Choose the default between 1 and 4.
-    max_available_threads_ = Max(Min(CPU::NumberOfProcessorsOnline(), 4), 1);
+    max_available_threads_ = Max(Min(OS::NumberOfProcessorsOnline(), 4), 1);
   }
 
   if (!FLAG_job_based_sweeping) {
     num_sweeper_threads_ =
         SweeperThread::NumberOfThreads(max_available_threads_);
   }
 
   if (FLAG_trace_hydrogen || FLAG_trace_hydrogen_stubs) {
     PrintF("Concurrent recompilation has been disabled for tracing.\n");
   } else if (OptimizingCompilerThread::Enabled(max_available_threads_)) {
@@ skipping 394 matching lines @@
       Execution::Call(this, microtask, factory()->undefined_value(),
                       0, NULL).Check();
     }
   }
 
   handle_scope_implementer()->DecrementCallDepth();
 }
 
 
 } }  // namespace v8::internal