Make XCoreSelectionDAGInfo take a DataLayout since it only needs
that information.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212146 91177308-0d34-0410-b5e6-96231b3b80d8
Move the subtarget dependent features from XCoreTargetMachine
down to the subtarget.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212147 91177308-0d34-0410-b5e6-96231b3b80d8