[AArch64] Add dot product support for AArch64 to binutils

gas/
	 * config/tc-aarch64.c (aarch64_reg_parse_32_64): Accept 4B.
	 (aarch64_features): Added dotprod.
	 * doc/c-aarch64.texi: Added dotprod.
	 * testsuite/gas/aarch64/dotproduct.d: New.
	 * testsuite/gas/aarch64/dotproduct.s: New.

opcodes/
	 * aarch64-asm.c (aarch64_ins_reglane): Added 4B dotprod.
	 * aarch64-dis.c (aarch64_ext_reglane): Likewise.
	 * aarch64-tbl.h (QL_V3DOT, QL_V2DOT): New.
	 (aarch64_feature_dotprod, DOT_INSN): New.
	 (udot, sdot): New.
	 * aarch64-dis-2.c: Regenerated.

include/
	 * opcode/aarch64.h: (AARCH64_FEATURE_DOTPROD): New.
	 (aarch64_insn_class): Added dotprod.

Cherry-pick of 65a55fbb.

Change-Id: I712657d13a2fdb43f14536aa0388dbbb2d13ee43