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

lib/Target/X86/InstPrinter/X86ATTInstPrinter.cpp

@@ -48,7 +48,7 @@ void X86ATTInstPrinter::printInst(const MCInst *MI, raw_ostream &OS,
         EmitAnyX86InstComments(MI, *CommentStream, getRegisterName);
 
   if (TSFlags & X86II::LOCK)
-    OS << "\tlock\n";
+    OS << "\tlock\t";
 
   // Output CALLpcrel32 as "callq" in 64-bit mode.
   // In Intel annotation it's always emitted as "call".