A more general (and simpler!) implementation of r99671. It performs a similar

transform. I.e., if a clean-up eh.selector call dominates the invoke of an
_Unwind_Resume_or_Rethrow, then we convert the eh.selector into a
catch-all. This patch, however, uses the DominatorTree information, and doesn't
go through the whole rigmarole of starting at the eh.exception call, finding the
corresponding URoR and eh.selector calls, and trying to trace through any number
of instruction types to get to them.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@99846 91177308-0d34-0410-b5e6-96231b3b80d8

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