[Issue 21026] add core.bitop.byteswap(ushort)

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21026

Walter Bright <bugzilla at digitalmars.com> changed:

           What    |Removed                     |Added
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            Summary|add                         |add
                   |core.bitop.bswap(ushort)    |core.bitop.byteswap(ushort)

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