[PATCH] Apply existing checks to C++1Z (has_feature_cxx0x); NFC

[Hubert Tong]

Hi rsmith, fraggamuffin, rcraik,

This applies the existing checks in `has_feature_cxx0x` to `-std=c++1z`.
In addition, references to C++1y are updated to refer to C++14.

http://reviews.llvm.org/D9885

Files:
  test/Lexer/has_feature_cxx0x.cpp

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