[RuntimeDyld] Revert r211652 - MachO object GDB registration support.

The registration scheme used in r211652 violated the read-only contract of
MemoryBuffer. This caused crashes in llvm-rtdyld where macho objects were backed
by read-only mmap'd memory.

llvm-svn: 213086
diff --git a/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.h b/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.h
index 24dc567..7025e22 100644
--- a/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.h
+++ b/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.h
@@ -113,9 +113,14 @@
   void finalizeLoad(ObjectImage &ObjImg,
                     ObjSectionToIDMap &SectionMap) override;
 
-  static ObjectImage *createObjectImage(ObjectBuffer *Buffer);
+  static ObjectImage *createObjectImage(ObjectBuffer *InputBuffer) {
+    return new ObjectImageCommon(InputBuffer);
+  }
+
   static ObjectImage *
-  createObjectImageFromFile(std::unique_ptr<object::ObjectFile> InputObject);
+  createObjectImageFromFile(std::unique_ptr<object::ObjectFile> InputObject) {
+    return new ObjectImageCommon(std::move(InputObject));
+  }
 };
 
 } // end namespace llvm