[AArch64] Fix move_lo_quad_<mode> move

[Sofiane Naci]

Hi,

This patch fixes a bug in the move_lo_quad_<mode> pattern.

The pattern, shown below, issues a scalar MOV instruction for vector modes:

(define_insn "move_lo_quad_<mode>"
  [(set (match_operand:VQ 0 "register_operand" "=w,w,w")
        (vec_concat:VQ
	  (match_operand:<VHALF> 1 "register_operand" "w,r,r")
	  (vec_duplicate:<VHALF> (const_int 0))))]
  "TARGET_SIMD"
  "@
   mov\\t%d0, %d1
   fmov\t%d0, %1
   ...

This is fixed by using DUP for the first alternative instead.

This passes the full regression test suite in aarch64-elf.

OK for trunk?

-----
Thanks
Sofiane
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