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When forcing single-lane SLP to emulate non-SLP behavior we need to disable heuristics designed to optimize SLP loads and instead in all cases resort to an interleaving scheme as requested by forcefully doing single-lane SLP. This fixes the remaining fallout for --param vect-force-slp=1 on x86. PR tree-optimization/116973 * tree-vect-slp.cc (vect_lower_load_permutations): Add force_single_lane parameter. Disable heuristic that keeps some load-permutations. (vect_analyze_slp): Pass force_single_lane to vect_lower_load_permutations.
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