Revert "Revert "[GlobalISel] Add legalization support for non-power-2 loads and stores""

We were shifting the wrong component of a split load when trying to combine them
back into a single value.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@358800 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed