[VPlan] Don't apply predication discount to non-originally-predicated blocks#160449

lukel97 wants to merge 7 commits intollvm:mainllvm/llvm-project:mainfrom

lukel97:loop-vectorize/dont-discount-unpredicated-blockslukel97/llvm-project:loop-vectorize/dont-discount-unpredicated-blocksCopy head branch name to clipboard