* sysdeps/powerpc/memset.S: Define & use symbolic register names.
Use C comments throughout. Line up operands column with tabs.
* sysdeps/powerpc/strchr.S: Likewise.
* sysdeps/powerpc/strcmp.S: Likewise.
* sysdeps/powerpc/strcpy.S: Likewise.
* sysdeps/powerpc/strlen.S: Likewise.
* sysdeps/powerpc/memset.S: Define & use symbolic register names.
Use C comments throughout. Line up operands column with tabs.
* sysdeps/powerpc/strchr.S: Likewise.
* sysdeps/powerpc/strcmp.S: Likewise.
* sysdeps/powerpc/strcpy.S: Likewise.
* sysdeps/powerpc/strlen.S: Likewise.