[PATCH] [Core] Add parallel infrastructure to lld.

[Shankar Kalpathi Easwaran]

================
Comment at: include/lld/Core/Parallel.h:76
@@ +75,3 @@
+
+/// \biref An implementation of an Executor that runs closures on a thread pool
+///   in filo order.
----------------
biref -> brief

================
Comment at: include/lld/Core/Parallel.h:126
@@ +125,3 @@
+  std::atomic<bool> _stop;
+  std::stack<std::function<void()>> _workQueue;
+  std::mutex _mutex;
----------------
do you want to call it as workStack instead ?


http://llvm-reviews.chandlerc.com/D649