[SLP]Change the insertion point for outside-block-used nodes and prevec phi operand gathers#139917

alexey-bataev merged 2 commits intomainllvm/llvm-project:mainfrom

users/alexey-bataev/spr/slpchange-the-insertion-point-for-outside-block-used-nodes-and-prevec-phi-operand-gathersllvm/llvm-project:users/alexey-bataev/spr/slpchange-the-insertion-point-for-outside-block-used-nodes-and-prevec-phi-operand-gathersCopy head branch name to clipboard