sparc: assembly version of memmove for ultra1+

Tested in sparcv9-*-* and sparc64-*-* targets in both non-multi-arch and
multi-arch configurations.

	* sysdeps/sparc/sparc32/sparcv9/memmove.S: New file.
	* sysdeps/sparc/sparc32/sparcv9/rtld-memmove.c: Likewise.
	* sysdeps/sparc/sparc64/memmove.S: Likewise.
	* sysdeps/sparc/sparc64/rtld-memmove.c: Likewise.

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>