[AArch64] PR target/65491: Classify V1TF vectors as AAPCS64 short vectors rather than composite types

	PR target/65491
	* config/aarch64/aarch64.c (aarch64_short_vector_p): Move above
	aarch64_composite_type_p.  Remove check for aarch64_composite_type_p.
	(aarch64_composite_type_p): Return false if given type and mode are
	for a short vector.

	PR target/65491
	* gcc.target/aarch64/pr65491_1.c: New test.
	* gcc.target/aarch64/aapcs64/type-def.h (vlf1_t): New typedef.
	* gcc.target/aarch64/aapcs64/func-ret-1.c: Add test for vlf1_t.

From-SVN: r223577