LoongArch gas support

LoongArch gas support

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

gas/
	* Makefile.am: Add LoongArch.
	* NEWS: Mention LoongArch support.
	* config/loongarch-lex-wrapper.c: New.
	* config/loongarch-lex.h: New.
	* config/loongarch-lex.l: New.
	* config/loongarch-parse.y: New.
	* config/tc-loongarch.c: New.
	* config/tc-loongarch.h: New.
	* configure.ac: Add LoongArch.
	* configure.tgt: Likewise.
	* doc/as.texi: Likewise.
	* doc/c-loongarch.texi: Likewise.
	* Makefile.in: Regenerate.
	* configure: Regenerate.
	* po/POTFILES.in: Regenerate.
gas/testsuite/
	* gas/all/gas.exp: Add LoongArch.
	* gas/elf/elf.exp: Likewise.
	* gas/loongarch/4opt_op.d: New.
	* gas/loongarch/4opt_op.s: Likewise.
	* gas/loongarch/fix_op.d: Likewise.
	* gas/loongarch/fix_op.s: Likewise.
	* gas/loongarch/float_op.d: Likewise.
	* gas/loongarch/float_op.s: Likewise.
	* gas/loongarch/imm_op.d: Likewise.
	* gas/loongarch/imm_op.s: Likewise.
	* gas/loongarch/jmp_op.d: Likewise.
	* gas/loongarch/jmp_op.s: Likewise.
	* gas/loongarch/load_store_op.d: Likewise.
	* gas/loongarch/load_store_op.s: Likewise.
	* gas/loongarch/loongarch.exp: Likewise.
	* gas/loongarch/macro_op.d: Likewise.
	* gas/loongarch/macro_op.s: Likewise.
	* gas/loongarch/nop.d: Likewise.
	* gas/loongarch/nop.s: Likewise.
	* gas/loongarch/privilege_op.d: Likewise.
	* gas/loongarch/privilege_op.s: Likewise.
	* gas/loongarch/syscall.d: Likewise.
	* gas/loongarch/syscall.s: Likewise.
	* lib/gas-defs.exp: Add LoongArch.