[PATCH, libstdc++] More

[Ed Smith-Rowland via libstdc++]

First of all, the redo of the iterator portion in response to 
https://gcc.gnu.org/ml/gcc-patches/2019-11/msg01467.html passed testing.

This patch contains constexpr char_traits. I also found an old extension 
that had been left out of the constexpr bandwagon that I caught up.

This patch also includes constexpr string_view::copy which depends on 
teh type_traits.

This gets all of p1032 except string::copy (although constexpr 
char_traits should almost enable this too once constexpr string is in).  
I'm done.

This passes on x86_64-linux.

OK?


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