[PATCH] D15846: [WinEH] Simplify unreachable catchpads

[Joseph Tremoulet via llvm-commits]

JosephTremoulet created this revision.
JosephTremoulet added reviewers: majnemer, rnk, andrew.w.kaylor.
JosephTremoulet added a subscriber: llvm-commits.

At least for CoreCLR, a catchpad which immediately executes an
`unreachable` instruction indicates that the exception can never have a
matching type, and so such catchpads can be removed, and so can their
catchswitches if the catchswitch becomes empty.

http://reviews.llvm.org/D15846

Files:
  include/llvm/IR/Instructions.h
  lib/IR/Instructions.cpp
  lib/Transforms/Utils/SimplifyCFG.cpp
  test/Transforms/SimplifyCFG/empty-catchpad.ll

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