[PATCH] [libcxx] Update the way the -std= flag is chosen by CMake and LibcxxTestFormat

[Eric Fiselier]

Change the default value for LIBCXX_ENABLE_CXX1Y to OFF instead of ON. GCC does not support the relaxed constexpr rules to compile libc++ as C++1y. 

(Also a gentle ping)

http://reviews.llvm.org/D4329

Files:
  CMakeLists.txt
  cmake/config-ix.cmake
  test/CMakeLists.txt
  test/lit.cfg
  test/lit.site.cfg.in
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