Optimize rb_ary_new_from_values() by using UnwrapCArrayNode

* Using an ArrayBuilderNode would be possible, but seems suboptimal
  given it remembers the maximum length, and probably most usages do
  not pass only simple primitives.

Author: eregon

src/main/c/cext/array.c

@@ -51,11 +51,8 @@ VALUE rb_ary_new_from_args(long n, ...) {
 }
 
 VALUE rb_ary_new_from_values(long n, const VALUE *values) {
-  VALUE array = rb_ary_new_capa(n);
-  for (int i = 0; i < n; i++) {
-    rb_ary_store(array, i, values[i]);
-  }
-  return array;
+  return rb_tr_wrap(polyglot_invoke(RUBY_CEXT, "rb_ary_new_from_values",
+    polyglot_from_VALUE_array(values, n)));
 }
 
 VALUE rb_assoc_new(VALUE a, VALUE b) {

src/main/java/org/truffleruby/cext/CExtNodes.java

@@ -1614,4 +1614,14 @@ protected Object checkSymbolCStr(Object string,
             return sym == null ? nil : sym;
         }
     }
+
+    @CoreMethod(names = "rb_ary_new_from_values", onSingleton = true, required = 1)
+    public abstract static class RbAryNewFromValues extends CoreMethodArrayArgumentsNode {
+        @Specialization
+        protected RubyArray rbAryNewFromValues(Object cArray,
+                @Cached UnwrapCArrayNode unwrapCArrayNode) {
+            final Object[] values = unwrapCArrayNode.execute(cArray);
+            return createArray(values);
+        }
+    }
 }