Fix win64 build (int conversion)

src/runtime.cc

 // Copyright 2010 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 10399 matching lines @@
     return Failure::Exception();
   }
 }
 
 
 // Sets a v8 flag.
 static MaybeObject* Runtime_SetFlags(Arguments args) {
   CONVERT_CHECKED(String, arg, args[0]);
   SmartPointer<char> flags =
       arg->ToCString(DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL);
-  FlagList::SetFlagsFromString(*flags, strlen(*flags));
+  FlagList::SetFlagsFromString(*flags, StrLength(*flags));
   return Heap::undefined_value();
 }
 
 
 // Performs a GC.
 // Presently, it only does a full GC.
 static MaybeObject* Runtime_CollectGarbage(Arguments args) {
   Heap::CollectAllGarbage(true);
   return Heap::undefined_value();
 }
 
 
 // Gets the current heap usage.
 static MaybeObject* Runtime_GetHeapUsage(Arguments args) {
-  int usage = Heap::SizeOfObjects();
+  int usage = static_cast<int>(Heap::SizeOfObjects());
   if (!Smi::IsValid(usage)) {
     return *Factory::NewNumberFromInt(usage);
   }
   return Smi::FromInt(usage);
 }
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 
 #ifdef ENABLE_LOGGING_AND_PROFILING
 static MaybeObject* Runtime_ProfilerResume(Arguments args) {
@@ skipping 382 matching lines @@
   } else {
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     Counters::gc_last_resort_from_js.Increment();
     Heap::CollectAllGarbage(false);
   }
 }
 
 
 } }  // namespace v8::internal