llvm-objdump: don't print relocations in non-relocatable files.

This matches the behavior of GNU objdump.

llvm-svn: 215844
diff --git a/llvm/lib/Object/MachOObjectFile.cpp b/llvm/lib/Object/MachOObjectFile.cpp
index 8e19eb5..afc729f 100644
--- a/llvm/lib/Object/MachOObjectFile.cpp
+++ b/llvm/lib/Object/MachOObjectFile.cpp
@@ -1688,6 +1688,10 @@
   }
 }
 
+bool MachOObjectFile::isRelocatableObject() const {
+  return getHeader().filetype == MachO::MH_OBJECT;
+}
+
 ErrorOr<std::unique_ptr<MachOObjectFile>>
 ObjectFile::createMachOObjectFile(std::unique_ptr<MemoryBuffer> &Buffer) {
   StringRef Magic = Buffer->getBuffer().slice(0, 4);