Speculative fix for MultithreadedParallelIsolates on ARM

test/cctest/test-lockers.cc

 // Copyright 2007-2011 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 222 matching lines @@
       CHECK_EQ(isolate, v8::internal::Isolate::Current());
       CalcFibAndCheck();
     }
     isolate->Dispose();
   }
  private:
 };
 
 // Run many threads each accessing its own isolate without locking
 TEST(MultithreadedParallelIsolates) {
+#ifdef V8_TARGET_ARCH_ARM
+  const int kNThreads = 10;
+#else
   const int kNThreads = 50;
+#endif
   i::List<JoinableThread*> threads(kNThreads);
   for (int i = 0; i < kNThreads; i++) {
     threads.Add(new IsolateNonlockingThread());
   }
   StartJoinAndDeleteThreads(threads);
 }
 
 
 class IsolateNestedLockingThread : public JoinableThread {
  public:
@@ skipping 342 matching lines @@
     v8::Locker locker_;
     v8::HandleScope handle_scope;
     context = v8::Context::New();
   }
   i::List<JoinableThread*> threads(kNThreads);
   for (int i = 0; i < kNThreads; i++) {
     threads.Add(new LockUnlockLockDefaultIsolateThread(context));
   }
   StartJoinAndDeleteThreads(threads);
 }