Allow running mjsunit/manual-parallel-recompile on single-core systems.

src/runtime.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 8052 matching lines @@
 RUNTIME_FUNCTION(MaybeObject*, Runtime_RunningInSimulator) {
   SealHandleScope shs(isolate);
 #if defined(USE_SIMULATOR)
   return isolate->heap()->true_value();
 #else
   return isolate->heap()->false_value();
 #endif
 }
 
 
+RUNTIME_FUNCTION(MaybeObject*, Runtime_IsParallelSupported) {
+  HandleScope scope(isolate);
+  return FLAG_parallel_recompilation
+      ? isolate->heap()->true_value() : isolate->heap()->false_value();
+}
+
+
 RUNTIME_FUNCTION(MaybeObject*, Runtime_OptimizeFunctionOnNextCall) {
   HandleScope scope(isolate);
   RUNTIME_ASSERT(args.length() == 1 || args.length() == 2);
   CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0);
 
   if (!function->IsOptimizable()) return isolate->heap()->undefined_value();
   function->MarkForLazyRecompilation();
 
   Code* unoptimized = function->shared()->code();
   if (args.length() == 2 &&
@@ skipping 5551 matching lines @@
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     isolate->counters()->gc_last_resort_from_js()->Increment();
     isolate->heap()->CollectAllGarbage(Heap::kNoGCFlags,
                                        "Runtime::PerformGC");
   }
 }
 
 
 } }  // namespace v8::internal