[PATCH] [lld][Core] Implement parallel_for_each

[Rui Ueyama]

No need to use recursion. Using for-loop like this is much simpler.

  void parallel_for_each(Iterator begin, iterator end, Func func) {
    TaskGroup tg;
    int taskSize = distance(begin, end) / concurrency;
    while (taskSize <= distance(begin, end)) {
      tg.spawn([=, &func, &tg] { std::for_each(begin, begin + taskSize, func); });
      begin += taskSize;
    }
    std::for_each(begin, end, func);
  }


http://reviews.llvm.org/D8348

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