[PATCH] [PlaceSimplify] Remove dependence on LoopSimplify

[Philip Reames]

Hi sanjoy,

As a step towards getting rid of internal pass manager hack entirely, remove the need for loop simplify to run in the inner pass manager.   The new code does produce slightly different loop structures, so this isn't technically NFC.

http://reviews.llvm.org/D9585

Files:
  lib/Transforms/Scalar/PlaceSafepoints.cpp
  test/Transforms/PlaceSafepoints/split-backedge.ll

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