[patch, nios2] Add mach parameter to nios2_find_opcode_hash

[Sandra Loosemore]

This patch is another installment in the series to add support for 
multiple ISAs to the Nios II back end.

The disassembler function nios2_find_opcode_hash returns an instruction 
descriptor object matching the instruction word parameter.  It will need 
to know which set of instruction encodings to match against, so this 
patch adds a mach parameter to the function.  Presently the parameter is 
unused (there is only one ISA defined so far), but I decided it made 
sense to push this interface change before a GDB patch that adds a 
dependency on this function for instruction matching.

Committed as obvious.

-Sandra


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