Implement rb_respond_to in Ruby to cover primitive cases

Author: chrisseaton

lib/truffle/truffle/cext.rb

@@ -947,6 +947,10 @@ def rb_funcall_with_block(recv, meth, args, block)
     recv.public_send(meth, *args, &block)
   end
 
+  def rb_respond_to(object, name)
+    object.respond_to?(name)
+  end
+
   def rb_funcallv_public(recv, meth, args)
     recv.public_send(meth, *args)
   end

src/main/c/cext/ruby.c

@@ -1892,7 +1892,7 @@ char* ruby_strdup(const char *str) {
 // Calls
 
 int rb_respond_to(VALUE object, ID name) {
-  return polyglot_as_boolean(RUBY_INVOKE_NO_WRAP(object, "respond_to?", name));
+  return RUBY_CEXT_INVOKE("rb_respond_to", object, ID2SYM(name));
 }
 
 VALUE rb_funcallv(VALUE object, ID name, int args_count, const VALUE *args) {