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

[Michael Spencer]

  * Add documentation
  * Make ThreadPoolExecutor filo
  * Make threadCount unsigned.
  * parallel_sort
    * Base max depth on input size
    * Tail execute one half of the sort.

Hi chandlerc, kledzik, shankarke, rafael,

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D649?vs=1576&id=1597#toc

Files:
  include/lld/Core/Parallel.h
  unittests/CoreTests/CMakeLists.txt
  unittests/CoreTests/ParallelTest.cpp
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