Print "lock \t foo" instead of "lock \n foo".

Print "lock \t foo" instead of "lock \n foo".

This gets gas and llc -filetype=obj to agree on the order of prefixes.

For llvm-mc we need to fix the asm parser to know that it makes a difference
on which line the "lock" is in.

Part of pr23594.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238232 91177308-0d34-0410-b5e6-96231b3b80d8