Add type assertion

Author: petebachant

ext/cuda/cuda_utils.jl

@@ -117,7 +117,8 @@ function auto_launch!(
                 if contains(func_name, "#")
                     func_name = split(func_name, "#")[1]
                 end
-                fp_split = splitpath(fpath_from_method_instance(frame.linfo))
+                fp_split =
+                    splitpath(fpath_from_method_instance(frame.linfo::Core.MethodInstance))
                 if "NVTX" in fp_split
                     fp_string = "_NVTX"
                     line_string = ""