[PATCH] Reassociate: reprocess RedoInsts after each instruction

[Mehdi AMINI]

Reuse the RPOT iterator with BuildRankMap() for efficiency purpose.

Note, this patch has been ran over the weekend on my fuzzer without any
new crash.


http://reviews.llvm.org/D6995

Files:
  lib/Transforms/Scalar/Reassociate.cpp
  test/Transforms/Reassociate/crash3.ll
  test/Transforms/Reassociate/crash4.ll
  test/Transforms/Reassociate/crash5.ll
  test/Transforms/Reassociate/crash6.ll
  test/Transforms/Reassociate/crash7.ll
  test/Transforms/Reassociate/crash8.ll

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