[PATCH] [Polly] Added arcanist (arc) unit test support

[Johannes Doerfert]

Hi grosser, sebpop, simbuerg,

  Thanks to Clemens (hammacher at cs.uni-saarland.de) extension of the
  arcanist unit test engine, we can run the llvm-lit tests automatically.

  Similar to the linters, aracanist will run all tests for each uploaded
  commit and asks the commiter for a statements in case unit tests fail.

  To use this feature the unit test engine needs to find the polly build
  directory. Currently we support the following setups:

    $POLLY_BUILD_DIR (environment variable)
    <root>/build
    <root>.build
    <root>-build
    <root:s/src/build>
    <cwd>

http://reviews.llvm.org/D4920

Files:
  .arcconfig
  utils/arcanist/LitTestEngine/__phutil_library_init__.php
  utils/arcanist/LitTestEngine/__phutil_library_map__.php
  utils/arcanist/LitTestEngine/src/LitTestEngine.php
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