This reverts commits: * [LoopVectorizer] NFCI: Calculate register usage based on TLI.getTypeLegalizationCost.b873aba394. * [LoopVectorizer] Silence warning in GetRegUsage.9ff701100a.
This reverts commits: * [LoopVectorizer] NFCI: Calculate register usage based on TLI.getTypeLegalizationCost.b873aba394. * [LoopVectorizer] Silence warning in GetRegUsage.9ff701100a.