[PATCH] Reassociate x + -0.1234 * y into x - 0.1234 * y

[Erik Verbruggen]

Rebased on top of r215647.

http://reviews.llvm.org/D4904

Files:
  lib/Target/README.txt
  lib/Transforms/Scalar/Reassociate.cpp
  test/Transforms/Reassociate/liftsign.ll
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