[committed 3/3] libstdc++: Cleanup whitespace and type trait usage in <optional>

[Jonathan Wakely]

This makes the formatting in <optional> consistent and also removes
redundant && tokens from template arguments for traits like
is_constructible and is_convertible.

libstdc++-v3/ChangeLog:

         * include/std/optional (_Optional_payload_base, _Optional_base)
         (optional, __optional_hash_call_base): Adjust whitespace and
         other formatting. Remove redundant && tokens on template
         arguments to type traits.


Tested powerpc64le-linux, committed to trunk.



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