[ruby/prism] Set contains_keywords flag for implicit gets($/, chomp: true) method call to handle -l CLI option

https://github.com/ruby/prism/commit/717e41c87d

prism/prism.c

@@ -21906,6 +21906,7 @@ wrap_statements(pm_parser_t *parser, pm_statements_node_t *statements) {
             ));
 
             pm_arguments_node_arguments_append(arguments, (pm_node_t *) keywords);
+            pm_node_flag_set((pm_node_t *) arguments, PM_ARGUMENTS_NODE_FLAGS_CONTAINS_KEYWORDS);
         }
 
         pm_statements_node_t *wrapped_statements = pm_statements_node_create(parser);

test/prism/api/command_line_test.rb

@@ -52,6 +52,9 @@ module Prism
       assert_kind_of CallNode, predicate
       assert_equal :gets, predicate.name
 
+      arguments = predicate.arguments
+      assert arguments.contains_keywords?
+
       arguments = predicate.arguments.arguments
       assert_equal 2, arguments.length
       assert_equal :$/, arguments.first.name