tree-optimization/101636 - CTOR vectorization ICE

tree-optimization/101636 - CTOR vectorization ICE

The following fixes an ICE when vectorizing the defs of a CTOR
results in a different vector type than expected.  That can happen
with AARCH64 SVE and a fixed vector length as noted in r10-5979
and on x86 with AVX512 mask CTORs and trying to re-vectorize
using SSE as shown in this bug.

The fix is simply to reject the vectorization when it didn't
produce the desired type.

2022-02-23  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/101636
	PR tree-optimization/104782
	* tree-vect-slp.c (vect_slp_analyze_operations): Make sure
	the CTOR is vectorized with an expected type.

	* c-c++-common/torture/pr101636.c: Likewise.
	* gcc.dg/vect/pr104782.c: New testcase.