[PATCH] D12353: [WinEH] Update coloring to handle nested cases cleanly

[Joseph Tremoulet via llvm-commits]

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

Change the coloring algorithm in WinEHPrepare to visit a funclet's exits
in its parents' contexts and so properly classify the continuations of
nested funclets.

Also change the placement of cloned blocks to be deterministic and to
maintain the relative order of each funclet's blocks.

Add a lit test showing various patterns that require cloning, the last
several of which don't have CHECKs yet because they require cloning
entire funclets which is NYI.


http://reviews.llvm.org/D12353

Files:
  lib/CodeGen/WinEHPrepare.cpp
  test/CodeGen/WinEH/wineh-cloning.ll

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