Add missing location info

Author: antoyo

Diff for: src/builder.rs

@@ -1120,9 +1120,9 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
         }
 
         let modified_ptr =
-            self.cx.context.new_cast(None, ptr, modified_destination_type.make_pointer());
-        let modified_destination = modified_ptr.dereference(None);
-        self.llbb().add_assignment(None, modified_destination, val);
+            self.cx.context.new_cast(self.location, ptr, modified_destination_type.make_pointer());
+        let modified_destination = modified_ptr.dereference(self.location);
+        self.llbb().add_assignment(self.location, modified_destination, val);
         // TODO(antoyo): handle `MemFlags::NONTEMPORAL`.
         // NOTE: dummy value here since it's never used. FIXME(antoyo): API should not return a value here?
         self.cx.context.new_rvalue_zero(self.type_i32())