MachineFunction: Cleanup/simplify MachineFunctionProperties::print()

- Always compile print() regardless of LLVM_ENABLE_DUMP. (We usually
  only gard dump() functions with that).
- Only show the set properties to reduce output clutter.
- Remove the unused variant that even shows the unset properties.
- Fix comments

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@279338 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed