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

src/objects.cc

 // Copyright 2013 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 9180 matching lines @@
          code()->optimizable());
   set_code_no_write_barrier(
       GetIsolate()->builtins()->builtin(Builtins::kLazyRecompile));
   // No write barrier required, since the builtin is part of the root set.
 }
 
 
 void JSFunction::MarkForParallelRecompilation() {
   ASSERT(is_compiled() && !IsOptimized());
   ASSERT(shared()->allows_lazy_compilation() || code()->optimizable());
-  ASSERT(FLAG_parallel_recompilation);
+  if (!FLAG_parallel_recompilation) {
+    JSFunction::MarkForLazyRecompilation();
+    return;
+  }
   if (FLAG_trace_parallel_recompilation) {
     PrintF("  ** Marking ");
     PrintName();
     PrintF(" for parallel recompilation.\n");
   }
   set_code_no_write_barrier(
       GetIsolate()->builtins()->builtin(Builtins::kParallelRecompile));
   // No write barrier required, since the builtin is part of the root set.
 }
 
@@ skipping 6602 matching lines @@
   return static_cast<Type*>(type_raw());
 }
 
 
 void PropertyCell::set_type(Type* type, WriteBarrierMode ignored) {
   set_type_raw(type, ignored);
 }
 
 
 } }  // namespace v8::internal