MC/Mach-O: Stub out explicit MCMachObjectTargetWriter interface.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121973 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/PowerPC/PPCAsmBackend.cpp b/lib/Target/PowerPC/PPCAsmBackend.cpp
index 1654335..d8ab689 100644
--- a/lib/Target/PowerPC/PPCAsmBackend.cpp
+++ b/lib/Target/PowerPC/PPCAsmBackend.cpp
@@ -19,6 +19,9 @@
 using namespace llvm;
 
 namespace {
+class PPCMachObjectWriter : public MCMachObjectTargetWriter {
+};
+
 class PPCAsmBackend : public TargetAsmBackend {
 const Target &TheTarget;
 public:
@@ -92,7 +95,8 @@
     
     MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
       bool is64 = getPointerSize() == 8;
-      return createMachObjectWriter(OS, /*Is64Bit=*/is64,
+      return createMachObjectWriter(new PPCMachObjectWriter,
+                                    OS, /*Is64Bit=*/is64,
                                     (is64 ? object::mach::CTM_PowerPC64 :
                                      object::mach::CTM_PowerPC),
                                     object::mach::CSPPC_ALL,