CodeGen/Passes: Pass MachineFunction as functor arg; NFC

Passing a MachineFunction as argument is more natural and avoids an
unnecessary round-trip through the logic determining the correct
Subtarget because MachineFunction already has a reference anyway.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@285039 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed