This allows hoisting of a common code, for instance if denominator
is loop invariant. Current change is expansion only, adding licm to
the target pass list going to be a separate patch. Given this patch
changes to codegen are minor as the expansion is similar to that on
DAG. DAG expansion still must remain for R600.
Differential Revision: https://reviews.llvm.org/D48586
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@335868 91177308-0d34-0410-b5e6-96231b3b80d8
Stanislav Mekhanoshin