[PATCH] Add support for auto-generating LIT tests by the build

[Edwin Vane]

  Fixing a "multiple rules generate X" warning from ninja

  CMake's Ninja generator was not detecting that test/lit.site.cfg.in and
  test/subdir/../lit.site.cfg.in were really the same file. Ninja noticed
  this and complained as both appeared as targets (for the missing file
  rule). Now canonicalizing the path to ensure the paths presented to
  CMake are identical and the duplication is now fixed.

Hi silvas, chandlerc, echristo,

http://llvm-reviews.chandlerc.com/D423

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D423?vs=1036&id=1063#toc

Files:
  test/CMakeLists.txt
  test/Makefile
  test/cpp11-migrate/CMakeLists.txt
  test/cpp11-migrate/Makefile
  test/cpp11-migrate/UseAuto/Inputs/gen_my_std.h.py
  test/cpp11-migrate/UseAuto/gen_basic_std_iterator_tests.cpp.py
  test/lit.cfg
  test/lit.site.cfg.in
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