[PATCH] [lld][Core] Implement parallel_for_each

[Rui Ueyama]

================
Comment at: include/lld/Core/Parallel.h:300
@@ +299,3 @@
+  const ptrdiff_t minParallelSizeForEach = 1024;
+  int64_t length = std::distance(begin, end);
+  int64_t taskSize =
----------------
Remove length.

================
Comment at: include/lld/Core/Parallel.h:304
@@ +303,3 @@
+  while (taskSize <= std::distance(begin, end)) {
+    tg.spawn([=, &func, &tg] { std::for_each(begin, begin + taskSize, func); });
+    begin += taskSize;
----------------
Remove &tg.

http://reviews.llvm.org/D8348

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