Merge pull request jruby#9252 from headius/data_var_accessors

Use prepared accessors to retrieve Data fields

Author: headius

core/src/main/java/org/jruby/RubyData.java

@@ -123,7 +123,7 @@ public static void initialize(ThreadContext context, IRubyObject self, IRubyObje
             String keyString = toSymbol(context, k).idString();
             VariableAccessor variableAccessor = variableAccessors.get(keyString);
             if (variableAccessor != null) {
-                selfObj.setInternalVariable(keyString, v);
+                variableAccessor.set(self, v);
             } else {
                 RubyArray unknownKeywords = unknownKeywordsPtr[0];
                 if (unknownKeywords == null) {