Andrew Trick 715b27f058 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.

llvm-svn: 237587

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

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