Fix typo: __aebi_memset -> __aeabi_memset

- remove two more _DIAGASSERT() checks against not NULL for functions
with arguments with nonnull attributes. in two cases, leave
code behind that should set defaults to "(null)".

Improve EABI handling of string functions. Most importantly, fix
__aeabi_memset, which has the arguments in the wrong order.

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

- remove bcmp(9), bcopy(9), and bzero(9) from libkern since <sys/systm.h> has
macro which replace them with mem*() functions in #ifdef _KERNEL as noted
in man pages
- move declarations of bcopy(3

- remove bcmp(9), bcopy(9), and bzero(9) from libkern since <sys/systm.h> has
macro which replace them with mem*() functions in #ifdef _KERNEL as noted
in man pages
- move declarations of bcopy(3) and bzero(3) into <lib/libsa/stand.h>
since they are still in libsa for some MD standalone sources
(I guess all bcmp(3) in standalone sources have been replaced with memcmp(3)
but they should be replaced with memcmp() anyway)

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Add local declarations of bcmp() and bzero() because libkern.h no longer
provides those declarations.

It's possible that these can be removed later when we find out whether
these functions are actua

Add local declarations of bcmp() and bzero() because libkern.h no longer
provides those declarations.

It's possible that these can be removed later when we find out whether
these functions are actually needed in the kernel, but meanwhile, this
allows alpha, hp700 and the powerpc ports (who all build these as part
of libkern) to complete their builds.

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Do like the non-__OPTIMIZE_SIZE__ variant, and compile memset() unless
BZERO is defined, instead of requiring MEMSET to be defined.

Avoids violating the principle of least astonishment, and also fix

Do like the non-__OPTIMIZE_SIZE__ variant, and compile memset() unless
BZERO is defined, instead of requiring MEMSET to be defined.

Avoids violating the principle of least astonishment, and also fixes
the build of stand/ and kernels for (at least) alpha.

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Make the size-optimized memset() actually conform to the man page
by returning the first arg.

Add /* __OPTIMIZE_SIZE__ */ comments on relevant #else and #endif lines.
Also change some #ifdef to #if defined() for consistency.

add bcopy and bzero for the benefit of loadfile.

handle fortify, ansify.

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