Utilize new SDNode flag functionality to expand current support for fadd

Summary: This patch originated from D46562 and is a proper subset, with some issues addressed.

Reviewers: spatel, hfinkel, wristow, arsenm, javed.absar

Reviewed By: spatel

Subscribers: wdng, nhaehnle

Differential Revision: https://reviews.llvm.org/D47909

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@334996 91177308-0d34-0410-b5e6-96231b3b80d8
6 files changed