Chris Lattner dd21a1cba4 enhance PHI slicing to handle the case when a slicable PHI is begin
used by a chain of other PHIs.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86503 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-09 01:38:00 +00:00
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