[PATCH] Reassociate x + -0.1234 * y into x - 0.1234 * y (part 2)

[Chad Rosier]

Update and rebase to address Renato's comments.

http://reviews.llvm.org/D5363

Files:
  lib/Transforms/Scalar/Reassociate.cpp
  test/Transforms/Reassociate/basictest.ll
  test/Transforms/Reassociate/canonicalize-neg-const.ll
  test/Transforms/Reassociate/liftsign.ll
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