PR rtl-optimization/119046: aarch64: Fix PARALLEL mode for vec_perm DUP expansion

The PARALLEL created in aarch64_evpc_dup is used to hold the lane number.
It is not appropriate for it to have a vector mode.
Other such uses use VOIDmode.
Do this here as well.
This avoids the risk of generic code treating the PARALLEL as trapping when it
has floating-point mode.

Bootstrapped and tested on aarch64-none-linux-gnu.

Signed-off-by: Kyrylo Tkachov <ktkachov@nvidia.com>

	PR rtl-optimization/119046
	* config/aarch64/aarch64.cc (aarch64_evpc_dup): Use VOIDmode for
	PARALLEL.

gcc/config/aarch64/aarch64.cc

@@ -26301,7 +26301,7 @@ aarch64_evpc_dup (struct expand_vec_perm_d *d)
   in0 = d->op0;
   lane = GEN_INT (elt); /* The pattern corrects for big-endian.  */
-  rtx parallel = gen_rtx_PARALLEL (vmode, gen_rtvec (1, lane));
+  rtx parallel = gen_rtx_PARALLEL (VOIDmode, gen_rtvec (1, lane));
   rtx select = gen_rtx_VEC_SELECT (GET_MODE_INNER (vmode), in0, parallel);
   emit_set_insn (out, gen_rtx_VEC_DUPLICATE (vmode, select));
   return true;