[LV] Refactor ILV to provide vectorizeInstruction(); NFC
Refactoring InnerLoopVectorizer's vectorizeBlockInLoop() to provide vectorizeInstruction(). Aligning DeadInstructions with its only user. Facilitates driving the transformation by VPlan - follows https://reviews.llvm.org/D28975 and its tentative breakdown. Differential Revision: https://reviews.llvm.org/D31997 llvm-svn: 300183
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