[CodeGen] Move printing '\n' from MachineInstr::print to MachineBasicBlock::print

MBB.print wasn't printing it, but the MIRPrinter is printing it. The
goal is to unify that as much as possible.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@324681 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed