[PATCH] [lld][Core] Implement parallel_for_each

[Rui Ueyama]

================
Comment at: include/lld/Core/Parallel.h:302
@@ +301,3 @@
+  int64_t taskSize =
+      (length < minParallelSizeForEach) ? length : minParallelSizeForEach;
+  while (taskSize <= std::distance(begin, end)) {
----------------
Just set 1024 unconditionally.

http://reviews.llvm.org/D8348

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