[Reassociate] Don't reassociate when mixing regular and fast-math FP
instructions.  Inlining might cause such cases and it's not valid to
reassociate floating-point instructions without the unsafe algebra flag.

Patch by Mehdi Amini <mehdi_amini@apple.com>!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221462 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed