This adds the actual MachineLegalizeHelper to do the work and a trivial pass
wrapper that legalizes all instructions in a MachineFunction. Currently the
only transformation supported is splitting up a vector G_ADD into one acting on
smaller vectors.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@276461 91177308-0d34-0410-b5e6-96231b3b80d8