[Patch, microblaze, gas, opcodes] Add support for clz insn

[David Holsgrove]

Add opcode for count leading zeros (clz) instruction,
counts number of leading zeros in register rA starting
from msb.

Expand microblaze allinsn.{s,d} testsuite coverage to
include new instruction.


binutils/opcodes/Changelog

 2012-11-08  Edgar E. Iglesias <edgar.iglesias@gmail.com>

          * microblaze-opc.h: Increase MAX_OPCODES
            (op_code_struct):  add clz insn
          * microblaze-opcm.h (microblaze_instr): add clz

binutils/gas/testsuite/Changelog

 2012-11-08  David Holsgrove  <david.holsgrove@xilinx.com>

          * gas/microblaze/allinsn.s: Add clz insn
          * gas/microblaze/allinsn.d: Likewise

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