Two things. Preserve the unwind_to when splitting a BB.
Add the ability to remove just one instance of a BB from a phi node. This fixes
the compile error in the tree now.
llvm-svn: 48085
diff --git a/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp b/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp
index 3607237..0dc38a2 100644
--- a/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp
+++ b/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp
@@ -160,6 +160,7 @@
while (isa<PHINode>(SplitIt))
++SplitIt;
BasicBlock *New = Old->splitBasicBlock(SplitIt, Old->getName()+".split");
+ New->setUnwindDest(Old->getUnwindDest());
// The new block lives in whichever loop the old one did.
if (Loop *L = LI.getLoopFor(Old))