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Add support for m32rx.
* config/tc-m32r.c (enable_m32rx): New static global.
(enable_special,warn_explicit_parallel_conflicts,optimize): Ditto.
(allow_m32rx): New function.
(M32R_SHORTOPTS): Add `O'.
(md_longopts): Add --m32rx plus several warning options.
(md_parse_option): Handle new options.
(md_show_usage): Print them.
(md_begin): Enable m32rx.
(OPERAND_IS_COND_BIT): New macro.
(first_writes_to_seconds_operands): New function.
(writes_to_pc,can_make_parallel,make_parallel): New functions.
(target_make_parallel,assemble_two_insns): New functions.
(md_assemble): Recognize "insn1 -> insn2" and "insn1 || insn2".
If optimizing and m32rx, try to make consecutive insns parallel.