[DWARFLinker][dsymutil] followup for 88c2137

That patch is a followup for "Move DwarfStreamer into DWARFLinker".
It fixes build with LLVM_LINK_LLVM_DYLIB.

Author: avl-llvm

llvm/lib/DWARFLinker/DWARFStreamer.cpp

@@ -27,8 +27,6 @@
 
 namespace llvm {
 
-static mc::RegisterMCTargetOptionsFlags MOF;
-
 bool DwarfStreamer::init(Triple TheTriple) {
   std::string ErrorStr;
   std::string TripleName;

llvm/tools/dsymutil/DwarfLinkerForBinary.cpp

@@ -83,6 +83,7 @@
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/Target/TargetOptions.h"
+#include "llvm/MC/MCTargetOptionsCommandFlags.h"
 #include <algorithm>
 #include <cassert>
 #include <cinttypes>
@@ -100,6 +101,9 @@
 #include <vector>
 
 namespace llvm {
+
+static mc::RegisterMCTargetOptionsFlags MOF;
+
 namespace dsymutil {
 
 static Error copySwiftInterfaces(