Duncan P. N. Exon Smith c46cfcbbc6 LoopUnroll: Create sub-loops in LoopInfo ...

`LoopUnrollPass` says that it preserves `LoopInfo` -- make it so.  In
particular, tell `LoopInfo` about copies of inner loops when unrolling
the outer loop.

Conservatively, also tell `ScalarEvolution` to forget about the original
versions of these loops, since their inputs may have changed.

Fixes PR20987.

llvm-svn: 219241

2014-10-07 21:19:00 +00:00

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