[PATCH] [Reassociation] Add support for reassociation with unsafe algebra.

[Chad Rosier]

Revised patch based on Chandler's comments.  This adds support for scalar floating-point instructions with unsafe math only (i.e., no vector support, yet).

Please have a look!

 Chad

http://reviews.llvm.org/D4129

Files:
  lib/Transforms/Scalar/Reassociate.cpp
  test/Transforms/Reassociate/fast-AgressiveSubMove.ll
  test/Transforms/Reassociate/fast-ArrayOutOfBounds.ll
  test/Transforms/Reassociate/fast-MissedTree.ll
  test/Transforms/Reassociate/fast-ReassociateVector.ll
  test/Transforms/Reassociate/fast-SubReassociate.ll
  test/Transforms/Reassociate/fast-basictest.ll
  test/Transforms/Reassociate/fast-fp-commute.ll
  test/Transforms/Reassociate/fast-mightymul.ll
  test/Transforms/Reassociate/fast-multistep.ll
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