LoongArch opcodes support

LoongArch opcodes support

2021-10-22  Chenghua Xu  <xuchenghua@loongson.cn>
	    Zhensong Liu  <liuzhensong@loongson.cn>
	    Weinan Liu  <liuweinan@loongson.cn>

include/
	* opcode/loongarch.h: New.
	* dis-asm.h: Declare print_loongarch_disassembler_options.
opcodes/
	* Makefile.am: Add LoongArch.
	* configure.ac: Likewise.
	* disassemble.c: Likewise.
	* disassemble.h: Declare print_insn_loongarch.
	* loongarch-coder.c: New.
	* loongarch-dis.c: New.
	* loongarch-opc.c: New.
	* Makefile.in: Regenerate.
	* configure: Regenerate.
	* po/POTFILES.in: Regenerate.