Put missing END() markers to set ELF symbol size.

branches: 1.3.34; 1.3.48;
Use xchgb, bswapl and not rotate/shift.

branches: 1.2.18;
don't rename bswap{16,32} if defined(_KERNEL) || defined(_STANDALONE).
(they are hidden by gcc-optimized versions, though.)

Merge libkern + libc common files. As requested by core.

sync with HEAD

Rebase.

Rebase to HEAD as of a few days ago.