fix typos in comments.

Add CVS ID line.

avoid redefinition warning for __OPTIMIZE_SIZE__.

Use __register_t instead of uregister_t - this is available to all ports
and both userland and kernel.

Cast the fill value to unsigned char so that the "fill" value used for
full-word fills isn't garbage.

Disable the larger/faster code path. While the optimised code path was
indeed quicker, it nonetheless failed to actually fill all the requested
memory with the specified value much of the time if a

Disable the larger/faster code path. While the optimised code path was
indeed quicker, it nonetheless failed to actually fill all the requested
memory with the specified value much of the time if a non-aligned start
address was used.

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remove trailing white space

Change CTASSERT to __CTASSERT (the spelling used in <sys/cdefs.h>),
include <sys/cdefs.h> so that it will be defined,
and move it to a better place.

The previous CTASSERT would never have been used

Change CTASSERT to __CTASSERT (the spelling used in <sys/cdefs.h>),
include <sys/cdefs.h> so that it will be defined,
and move it to a better place.

The previous CTASSERT would never have been used because
of the ifdef. If it had been used, it would have had
unwanted effects from being just after the "static inline"
that appears when BZERO is defined.

Also move the __RCSID to a more conventional location.

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libkern.h maps memcmp, memset and strcpy to the compiler builtins on
some platforms, so make sure to #undef them first.

Merge from matt-nb5-mips64