tree-optimization/102046 - fix SLP build from scalars with patterns

tree-optimization/102046 - fix SLP build from scalars with patterns

When we swap operands for SLP builds we lose track where exactly
pattern defs are - but we fail to update the any_pattern member
of the operands info.  Do so conservatively.

2021-08-25  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/102046
	* tree-vect-slp.c (vect_build_slp_tree_2): Conservatively
	update ->any_pattern when swapping operands.

	* gcc.dg/vect/pr102046.c: New testcase.

(cherry picked from commit 29c77454e5ab33ce06a741eacdfbd5348fbccc95)