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.
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input files for code generators into defs/ directory.
* Makefile.in (lex.c): followed keywords and lex.c.src.
* common.mk (parser.o): followed keywords.
(INSNS): followed opt_*.def
* tools/instruction.rb: followed opt_*.def.
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