[Patch] Add C++14 feature querying macro `cxx_digit_separators` describing support for "Single-Quotation-Mark as a Digit Separator"

[Michel Morin]

The support for C++14 digit separators was already added in Clang 3.4.
But there is no querying macro for the feature.

I've attached a patch for adding the macro.

Regards,
Michel
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