Using private symbols for the promise resolver.

Author: iamstolis

graal-nodejs/mx.graal-nodejs/com.oracle.truffle.trufflenode/src/com/oracle/truffle/trufflenode/GraalJSAccess.java

@@ -319,8 +319,8 @@ public final class GraalJSAccess {
     private static final Map<Integer, HiddenKey> INTERNAL_FIELD_KEYS_MAP = new ConcurrentHashMap<>();
     private static final HiddenKey[] INTERNAL_FIELD_KEYS_ARRAY = createInternalFieldKeysArray(10);
 
-    private static final Symbol RESOLVER_RESOLVE = Symbol.create(RESOLVE);
-    private static final Symbol RESOLVER_REJECT = Symbol.create(REJECT);
+    private static final Symbol RESOLVER_RESOLVE = Symbol.createPrivate(RESOLVE);
+    private static final Symbol RESOLVER_REJECT = Symbol.createPrivate(REJECT);
 
     public static final HiddenKey HOLDER_KEY = new HiddenKey("Holder");
     public static final HiddenKey ACCESSOR_KEY = new HiddenKey("Accessor");