target-supports.exp (check_effective_target_vect_pack_trunc): Rename from check_effective_target_vect_pack_mod.

	* lib/target-supports.exp (check_effective_target_vect_pack_trunc):
	Rename from check_effective_target_vect_pack_mod.  Rename global
	variable et_vect_pack_mod to et_vect_pack_trunc.  Update debug
	messages.
	* gcc.dg/vect/vect-iv-8.c: Update target check for vect_pack_trunc
	rename.
	* gcc.dg/vect/vect-iv-8a.c: Ditto.
	* gcc.dg/vect/vect-multitypes-8.c: Ditto.

From-SVN: r124057