Andrew Trick 0b9ee775f5 indvars cruft: don't replace phi nodes for no reason. ...

Don't replace a phi with an identical phi. This was done long ago to
"preserve" IVUsers analysis. The code has already called
SE->forgetValue(PN) so I see no purpose in creating a new value for
the phi.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237587 91177308-0d34-0410-b5e6-96231b3b80d8

2015-05-18 16:49:34 +00:00

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