Revert "Recommit "[VPlan] First step towards VPlan cost modeling. (#92555)"" This reverts commit 242cc200ccb24e22eaf54aed7b0b0c84cfc54c0b and eea150c84053035163f307b46549a2997a343ce9, as it is causing a build bot failure and there have been a number of crashes reported at https://github.com/llvm/llvm-project/pull/92555
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