[PATCH] [LoopRerolling] Be more forgiving with instruction order.

[James Molloy]

Hi hfinkel,

We can't solve the full subgraph isomorphism problem. But we can
allow obvious cases, where for example two instructions of different
types are out of order. Due to them having different types/opcodes,
there is no ambiguity.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7562

Files:
  lib/Transforms/Scalar/LoopRerollPass.cpp
  test/Transforms/LoopReroll/basic.ll

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