[CodeGen] Print MI without a newline when skipping debugloc. NFC.

This matches the behavior for skip-operands. While there, document it.
This is a follow-up to r296007.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296011 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed