[Bug libc/20530] bswap_16 should use __builtin_bswap16() when available

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=20530

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |fweimer at redhat dot com
              Flags|                            |security-

--- Comment #1 from Florian Weimer <fweimer at redhat dot com> ---
An alternative fix would be to use bit shifts.  I expect GCC will fold them
into __builtin_bswap16, too.

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