Reid Kleckner 3e9fadfbc8 [WinEH] Try to make the MachineFunction CFG more accurate ...

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.

llvm-svn: 235037

2015-04-15 18:48:15 +00:00

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