[DAGCombiner] Add splatted vector support to (udiv x, (shl pow2, y)) -> x >>u (log2(pow2)+y)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@284491 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed