[PATCH] Don't crash on leaving nested __finally blocks through an EH edge.

[Nico Weber]

Hi rnk,

The __finally emission block tries to be clever by removing unused continuation edges if there's an unconditional jump out of the __finally block. With exception edges, the EH continuation edge isn't always unused though and we'd crash in a few places.

Just don't be clever. That makes the IR for __finally blocks a bit longer in some cases (hence small and behavior-preserving changes to existing tests), but it makes no difference in general and it fixes the last crash from PR22553.

http://reviews.llvm.org/D7918

Files:
  lib/CodeGen/CGException.cpp
  test/CodeGen/exceptions-seh-finally.c
  test/CodeGen/exceptions-seh-leave.c

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