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[PATCH, C++, CPP] Add C++1z to the preprocessor. Rename C++1y to C++14.


Here are some C++ versioning changes reflecting C++14 status and adding c++1z. It is a followup to Jason's patch on 2014-06-26 adding std=c++1z, etc.

This will allow us to start making C++1z changes to the preprocessor (n3981 remove trigraphs).

In fact, I made trigraphs opt-in for both c++1z and gnu++1z.

I did not change c-family/c.opt to change wording on options and aliasing to document C++14. Should we do that too?

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