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
This avoids emitting code for unreachable landingpad blocks that contain calls to llvm.eh.actions and indirectbr. It's also a first step towards unifying the SEH and WinEH lowering codepaths. I'm keeping the old fan-in lowering of SEH around until the preparation version works well enough that we can switch over without breaking existing users. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235037 91177308-0d34-0410-b5e6-96231b3b80d8