Move TargetLoweringObjectFile from CodeGen to Target to fix layering

It's implemented in Target & include from other Target headers, so the
header should be in Target.

llvm-svn: 328392
diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp b/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
index 171de3c..16ce3d7 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
@@ -23,7 +23,6 @@
 #include "llvm/ADT/iterator_range.h"
 #include "llvm/CodeGen/MachineFunction.h"
 #include "llvm/CodeGen/MachineOperand.h"
-#include "llvm/CodeGen/TargetLoweringObjectFile.h"
 #include "llvm/CodeGen/TargetRegisterInfo.h"
 #include "llvm/CodeGen/TargetSubtargetInfo.h"
 #include "llvm/IR/Constants.h"
@@ -38,6 +37,7 @@
 #include "llvm/MC/MachineLocation.h"
 #include "llvm/Support/Casting.h"
 #include "llvm/Support/CommandLine.h"
+#include "llvm/Target/TargetLoweringObjectFile.h"
 #include <cassert>
 #include <cstdint>
 #include <string>