[MIPS] Add saa and saad instructions for octeon

[Andrew Pinski <andrew dot pinski at caviumnetworks dot com>]

Hi,
  This patch adds the saa and saad instructions for Octeon.   They are
not part of the original Octeon but are part of the Octeon+.  We at
Cavium don't feel the need to add a new arch for it since this is the
only difference instruction wise and the original Octeon is no longer
in production.

OK? Tested with a cross binutils to mips64-linux-gnu with no regressions.

Thanks,
Andrew Pinski

PS I don't currently have binutils write access but Cavium has a
blanket copyright assignment on file.

gas/ChangeLog:
* config/tc-mips.c (macro): Add support for M_SAA_AB and M_SAAD_AB.
(mips_ip <case '(' >): Allow 's' after '('.

gas/testsuite/ChangeLog:
* gas/mips/mips.exp: Add octeon-saa-saad.
* gas/mips/octeon-saa-saad.d: New file.
* gas/mips/octeon-saa-saad.s: New file

include/opcode/ChangeLog:
* mips.h (M_SAA_AB, M_SAAD_AB): New enum values.

opcodes/ChangeLog:
* mips-opc.c (micromips_opcodes): Add "saa" and "saad".

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