ipa/119067 - bogus TYPE_PRECISION check on VECTOR_TYPE

odr_types_equivalent_p can end up using TYPE_PRECISION on vector
types which is a no-go.  The following instead uses TYPE_VECTOR_SUBPARTS
for vector types so we also end up comparing the number of vector elements.

	PR ipa/119067
	* ipa-devirt.cc (odr_types_equivalent_p): Check
	TYPE_VECTOR_SUBPARTS for vectors.

	* g++.dg/lto/pr119067_0.C: New testcase.
	* g++.dg/lto/pr119067_1.C: Likewise.