mesa: use _slang_alloc()

src/mesa/shader/slang/slang_compile_function.c

@@ -70,7 +70,7 @@ slang_function *
 slang_function_new(slang_function_kind kind)
 {
    slang_function *fun = (slang_function *)
-      _mesa_malloc(sizeof(slang_function));
+      _slang_alloc(sizeof(slang_function));
    if (fun) {
       slang_function_construct(fun);
       fun->kind = kind;

src/mesa/shader/slang/slang_typeinfo.c

@@ -296,7 +296,7 @@ slang_type_specifier_new(slang_type_specifier_type type,
                          struct slang_type_specifier_ *_array)
 {
    slang_type_specifier *spec =
-      (slang_type_specifier *) _mesa_malloc(sizeof(slang_type_specifier));
+      (slang_type_specifier *) _slang_alloc(sizeof(slang_type_specifier));
    if (spec) {
       spec->type = type;
       spec->_struct = _struct;