[AArch64, Obvious] Fix formatting of SHLL and friends

gcc/

	* config/aarch64/aarch64-simd.md
	(aarch64_<ANY_EXTEND:su><ADDSUB:optab>l<mode>): Add a tab between
	output mnemonic and operands.
	(aarch64_simd_vec_unpack<su>_lo_<mode>): Likewise.
	(aarch64_simd_vec_unpack<su>_hi_<mode>): Likewise.

From-SVN: r217917