The current codegen code to support VF's that are multiples of a simdclone
simdlen rely on BIT_FIELD_REF to create multiple input vectors.  This does not
work for non-constant simdclones, so we should disable using such clones when
the VF is a multiple of the non-constant simdlen until we change the codegen to
support those.

gcc/ChangeLog:

	* tree-vect-stmts.cc (vectorizable_simd_clone_call): Reject simdclones
	with non-constant simdlen when VF is not exactly the same.