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Commit 80e7e5a4 authored by Chris Lattner's avatar Chris Lattner
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Make jump threading eliminate blocks that just contain phi nodes, 

debug intrinsics, and an unconditional branch when possible.  This
reuses the TryToSimplifyUncondBranchFromEmptyBlock function split
out of simplifycfg.

llvm-svn: 86722
parent 4a720a36
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