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1> on every path through the CFG, a FrameSetup <n> is always followed by a FrameDestroy <n> and a FrameDestroy is always followed by a FrameSetup. 2> stack adjustments are identical on all CFG edges to a merge point. 3> frame is destroyed at end of a return block. PR16393 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186350 91177308-0d34-0410-b5e6-96231b3b80d8
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