Operand unification technique enable to combine
  an instruction and specific operands and make new
  instruction.
* defs/opt_operand.def: add several configuration
  of operand unifications.
* insns.def: use `int' instead to suppress warning.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38173 b2dd03c8-39d4-4d8f-98ff-823fe69b080e