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[binutils-gdb] opcodes/arc: Support dmb instruction with no operands

*** TEST RESULTS FOR COMMIT 5ba8bc973cca60cb06bf41a2808ba6fa4ed02879 ***

Author: Andrew Burgess <andrew.burgess@embecosm.com>
Branch: master
Commit: 5ba8bc973cca60cb06bf41a2808ba6fa4ed02879

opcodes/arc: Support dmb instruction with no operands

In this GCC commit:
  https://gcc.gnu.org/ml/gcc-patches/2015-12/msg00735.html
GCC started emitting dmb instructions with no operands.  The intention
was that dmb with no operands should be an alias for 'dmb 0'.

The following patch extends the arc opcodes library to support dmb with
no operands.

opcodes/ChangeLog:

	* arc-tbl.h (dmb): Add a no operand version of dmb.
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