Add the remaining missing comments for IEEE 754 special value array
indices.  Reindent macro definitions for consistency.
Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9671/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>