[BACKEND] two minor bugfix on StoreOpLowering and kernel launch & support optional other in LoadOpLowering (#69)

* [BACKEND] two minor bugfix on StoreOpLowering and kernel launch & support optional other in LoadOpLowering

* Clean code

Co-authored-by: goostavz <gzhu@nvidia.com>
Co-authored-by: Yan Chunwei <yanchunwei@outlook.com>

python/src/triton.cc

@@ -258,9 +258,9 @@ void parse_args(py::list &args, py::list do_not_specialize,
 
 void parse_args(py::list &args, py::list &arg_names, std::string &params,
                 size_t &params_size, py::dict constants) {
-  char *params_ptr = params.data();
-
   size_t len = PyList_Size(args.ptr());
+  params.reserve(8 * len); // 8 max bytes by argument
+  char *params_ptr = params.data();
   for (int i = 0; i < len; i++) {
     py::object arg = args[i];
     auto arg_ptr = arg.ptr();