[PATCH] Use WinEHPrepare to outline SEH finally blocks

[Reid Kleckner]

REPOSITORY
  rL LLVM

================
Comment at: llvm/trunk/lib/CodeGen/WinEHPrepare.cpp:1194
@@ +1193,3 @@
+      // Once we reach a catch-all, don't expect to hit a resume instruction.
+      BB = nullptr;
+      break;
----------------
andrew.w.kaylor wrote:
> This is wrong for the C++ EH case, which can have cleanup code to be executed after a catch-all handler.  Setting BB to NULL will prevent use from finding the cleanup in that scenario.
Can you elaborate? Is this a cleanup inside the catch, or outside the catch? I don't think it's possible to have exceptional cleanups after a catchall:
  void f() {
    HasDtor o;
    try { g(); }
    catch (...) { g(); }
  }

http://reviews.llvm.org/D8370

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