Use the new getRegAllocationHints() hook from AllocationOrder.

This simplifies the hinting code quite a bit while making the targets
easier to write at the same time.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169173 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed