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[PATCH] Add std::__is_byte<std::byte> specialization


	* include/bits/cpp_type_traits.h [__cplusplus >= 201703]
	(__is_byte<byte>): Define specialization for std::byte.

This is used in <algorithm> to decide whether to optimize fills to
memset, so we want to enable it for std::byte.

It could also be used to simplify __is_byte_like in <functional>,
which I might do at a later date.

Tested x86_64-linux, committed to trunk.

Attachment: patch.txt
Description: Text document


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