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This is a fix for PR30318. Clang may generate IR where an alloca is already live when entering a BB with lifetime.start. In this case, conservatively extend the alloca lifetime all the way back to the block entry. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@281784 91177308-0d34-0410-b5e6-96231b3b80d8