Convert MachOObjectFile to a template.

For now it is templated only on being 64 or 32 bits. I will add little/big
endian next.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179097 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/llvm-objdump/llvm-objdump.cpp b/tools/llvm-objdump/llvm-objdump.cpp
index 9a36e82..4790d7a 100644
--- a/tools/llvm-objdump/llvm-objdump.cpp
+++ b/tools/llvm-objdump/llvm-objdump.cpp
@@ -255,7 +255,7 @@
     std::sort(Rels.begin(), Rels.end(), RelocAddressLess);
 
     StringRef SegmentName = "";
-    if (const MachOObjectFile *MachO = dyn_cast<const MachOObjectFile>(Obj)) {
+    if (const MachOObjectFileBase *MachO = dyn_cast<const MachOObjectFileBase>(Obj)) {
       DataRefImpl DR = i->getRawDataRefImpl();
       SegmentName = MachO->getSectionFinalSegmentName(DR);
     }
@@ -591,7 +591,7 @@
       else if (Section == o->end_sections())
         outs() << "*UND*";
       else {
-        if (const MachOObjectFile *MachO = dyn_cast<const MachOObjectFile>(o)) {
+        if (const MachOObjectFileBase *MachO = dyn_cast<const MachOObjectFileBase>(o)) {
           DataRefImpl DR = Section->getRawDataRefImpl();
           StringRef SegmentName = MachO->getSectionFinalSegmentName(DR);
           outs() << SegmentName << ",";