Update a comment, now that tail duplication happens after other branch
folding optimizations. llvm-svn: 89109
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@ -1230,8 +1230,8 @@ ReoptimizeBlock:
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// If the previous block unconditionally falls through to this block and
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// this block has no other predecessors, move the contents of this block
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// into the prior block. This doesn't usually happen when SimplifyCFG
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// has been used, but it can happen if tail duplication eliminates all the
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// non-branch predecessors of a block leaving only the fall-through edge.
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// has been used, but it can happen if tail merging splits a fall-through
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// predecessor of a block.
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// This has to check PrevBB->succ_size() because EH edges are ignored by
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// AnalyzeBranch.
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if (PriorCond.empty() && !PriorTBB && MBB->pred_size() == 1 &&
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