PATCH: Add bits/byteswap-16.h and use GCC builtin 32/64-bit bswap

[Roland McGrath]

> The updated patch is at
> 
> http://sourceware.org/git/?p=glibc.git;a=patch;h=8b89aff0004899a676c3eff0b7ab82519fc8d99a

You should probably post patches as well as publishing them in git.
The private git branches might not live forever, but the list archive will.

This is still doing more than simply splitting out bswap_16,
like dropping the i386 file completely though it has i386-specific
code for bswap_32.

Please post a patch that really affects only bswap_16.


Thanks,
Roland