Davide Italiano 20cb7e887f [LoopUnroll] Properly update loop structure in case of successful peeling. ...

When peeling kicks in, it updates the loop preheader.
Later, a successful full unroll of the loop needs to update a PHI
which i-th argument comes from the loop preheader, so it'd better look
at the correct block. Fixes PR33437.

Differential Revision:  https://reviews.llvm.org/D37153

llvm-svn: 311922

2017-08-28 20:29:33 +00:00

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