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Commit d33f4efb authored by Manman Ren's avatar Manman Ren
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SimplifyCFG: fold unconditional branch to its predecessor if profitable.

This patch extends FoldBranchToCommonDest to fold unconditional branches.
For unconditional branches, we fold them if it is easy to update the phi nodes 
in the common successors.

rdar://10554090

llvm-svn: 158392
parent 0948d93b
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