Move resetTargetOptions from taking a MachineFunction to a Function
since we are accessing the TargetMachine that we're a member
function of.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218489 91177308-0d34-0410-b5e6-96231b3b80d8
Have setSubtarget take a const subtarget.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218490 91177308-0d34-0410-b5e6-96231b3b80d8