[PATCH] Add VTune as an optional external dependency and add task tracking.

[Michael Spencer]

Hi kledzik, shankarke, rafael,

http://llvm-reviews.chandlerc.com/D634

Files:
  CMakeLists.txt
  cmake/modules/FindVTune.cmake
  include/lld/Core/Instrumentation.h
  lib/Core/PassManager.cpp
  lib/Passes/LayoutPass.cpp
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