Reapply "[VPlan] Move predication to VPlanTransform (NFC). (#128420)" This reverts commit 793bb6b257fa4d9f4af169a4366cab3da01f2e1f. The recommitted version contains a fix to make sure only the original phis are processed in convertPhisToBlends nu collecting them in a vector first. This fixes a crash when no mask is needed, because there is only a single incoming value. Original message: This patch moves the logic to predicate and linearize a VPlan to a dedicated VPlan transform. It mostly ports the existing logic directly. There are a number of follow-ups planned in the near future to further improve on the implementation: * Edge and block masks are cached in VPPredicator, but the block masks are still made available to VPRecipeBuilder, so they can be accessed during recipe construction. As a follow-up, this should be replaced by adding mask operands to all VPInstructions that need them and use that during recipe construction. * The mask caching in a map also means that this map needs updating each time a new recipe replaces a VPInstruction; this would also be handled by adding mask operands. PR: https://github.com/llvm/llvm-project/pull/128420
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