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* Teach this code to move allocas out of the loop when tail call eliminating a call marked 'tail'. This implements TailCallElim/move_alloca_for_tail_call.ll * Do not perform this transformation if a call is marked 'tail' and if there are allocas that we cannot move out of the loop in #2. Doing so would increase the stack usage of the function. This implements fixes PR615 and TailCallElim/dont-tce-tail-marked-call.ll. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22690 91177308-0d34-0410-b5e6-96231b3b80d8
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