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33102d2faa
PhiNode, SwitchInst, LandingPad and IndirectBr all had virtually identical logic for growing the hung off uses. Move it to User so that they can all call a single shared implementation. Their destructors were all empty after this change and were deleted. They all have virtual clone_impl methods which can be used as vtable anchors. Reviewed by Duncan Exon Smith. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239492 91177308-0d34-0410-b5e6-96231b3b80d8
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