8332457: Examine startup overheads from JDK-8294961

8229959: Convert proxy class to use constant dynamic

Reviewed-by: liach, redestad

src/java.base/share/classes/java/lang/reflect/Proxy.java

@@ -856,6 +856,8 @@ public class Proxy implements java.io.Serializable {
          */
         private static void ensureAccess(Module target, Class<?> c) {
             Module m = c.getModule();
+            if (target == m) return;
+
             // add read edge and qualified export for the target module to access
             if (!target.canRead(m)) {
                 Modules.addReads(target, m);