Move NumberOfProcessorsOnline from CPU to OS

src/platform-win32.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.
 
 // Platform-specific code for Win32.
 
 // Secure API functions are not available using MinGW with msvcrt.dll
 // on Windows XP. Make sure MINGW_HAS_SECURE_API is not defined to
 // disable definition of secure API functions in standard headers that
 // would conflict with our own implementation.
@@ skipping 1178 matching lines @@
 void OS::LogSharedLibraryAddresses(Isolate* isolate) { }
 void OS::SignalCodeMovingGC() { }
 #endif  // __MINGW32__
 
 
 unsigned OS::CpuFeaturesImpliedByPlatform() {
   return 0;  // Windows runs on anything.
 }
 
 
+int OS::NumberOfProcessorsOnline() {
+  SYSTEM_INFO info;
+  GetSystemInfo(&info);
+  return info.dwNumberOfProcessors;
+}
+
+
 double OS::nan_value() {
 #ifdef _MSC_VER
   // Positive Quiet NaN with no payload (aka. Indeterminate) has all bits
   // in mask set, so value equals mask.
   static const __int64 nanval = kQuietNaNMask;
   return *reinterpret_cast<const double*>(&nanval);
 #else  // _MSC_VER
   return NAN;
 #endif  // _MSC_VER
 }
@@ skipping 213 matching lines @@
   ASSERT(result);
 }
 
 
 
 void Thread::YieldCPU() {
   Sleep(0);
 }
 
 } }  // namespace v8::internal