Backport from mainline:

gas/testsuite:

2012-10-26  Christian Groessler  <chris@groessler.org>

        * gas/z8k/z8k.exp: Run translate-ops test.
        * gas/z8k/translate-ops.s: New file.
        * gas/z8k/translate-ops.d: New file.

opcodes:

2012-10-26  Christian Groessler  <chris@groessler.org>

        * z8kgen.c (struct op): Fix encoding for translate opcodes (trdb,
        trdrb, trib, trirb, trtdb, trtdrb, trtib, trtirb).  Remove
        non-existing opcode trtrb.
        * z8k-opc.h: Regenerate.
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