[committed 2/4] libstdc++: Reorder declarations of std::span members

[Jonathan Wakely]

I find it easier to work with this class when the declarations match the
order in the C++2a working paper.

There's no need to use long, descriptive template parameter names like
_ContiguousIterator when the parameter is already constrained by the
std::contiguous_iterator concept. This is also consistent with the
naming conventions in the working paper.

         * include/std/span (span): Reorder members and rename template
         parameters to match declarations in the C++2a working paper.


Tested powerpc64le-linux, committed to trunk.


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