Add new INSN_* into mips.h

[Nick Clifton]

Hi Eric.

   I was hoping that a MIPS person would answer this, but ...

> I have two solutions for this problem. One is to add a new field
> "membership2" into struct mips_opcode, just like what "pinfo2" does.
> 
> Another way is to change the "membership" field from bit collection to
> a function address. So mips_builtin_opcodes will look like this,

Personally I would go with whichever method is the least intrusive, and 
hence the least likely to generate new bugs.  To me this sounds like 
your first suggestion - the second membership mask.

Cheers
   Nick