This patch refactors the sparc64 ifunc selector to a C implementation.
Also, the generic symbol is moved to its own implementation file
sub_n-generic.S).
Checked on sparc64-linux-gnu and sparcv9-linux-gnu.
* sysdeps/sparc/sparc64/multiarch/Makefile (sysdep_routines):
Add sub_n-generic.
* sysdeps/sparc/sparc64/multiarch/sub_n-generic.S: New file.
* sysdeps/sparc/sparc64/multiarch/sub_n.c: Likewise.
* sysdeps/sparc/sparc64/multiarch/sub_n.S: Remove file.
Signed-off-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>