MIRParser: Move MachineFunction reference into PFS; NFC

Code cleanup: The PerFunctionMIParsingState is per function, moving a
reference into PFS we can avoid passing around the MachineFunction in an
extra parameter most of the time.

Also change most signatures to consistently pass PFS reference first.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@275329 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed