Merge commit '84576c7b5d4f' from llvm.org/main into next

Author: git apple-llvm automerger

llvm/lib/ExecutionEngine/RuntimeDyld/Targets/RuntimeDyldMachOX86_64.h

@@ -157,8 +157,7 @@ class RuntimeDyldMachOX86_64
   processSubtractRelocation(unsigned SectionID, relocation_iterator RelI,
                             const MachOObjectFile &BaseObj,
                             ObjSectionToIDMap &ObjSectionToID) {
-    const MachOObjectFile &Obj =
-        static_cast<const MachOObjectFile&>(BaseObj);
+    const MachOObjectFile &Obj = BaseObj;
     MachO::any_relocation_info RE =
         Obj.getRelocation(RelI->getRawDataRefImpl());