PR target/81622
	* config/rs6000/rs6000-c.c (altivec_resolve_overloaded_builtin): For
	__builtin_vec_cmpne verify both arguments are compatible vectors
	before looking at TYPE_MODE on the element type.  For __builtin_vec_ld
	verify arg1_type is a pointer or array type.  For __builtin_vec_st,
	move computation of aligned to after checking the argument types.
	Formatting fixes.

	* gcc.target/powerpc/pr81622.c: New test.

From-SVN: r250785