Resolve static methods of enum in front-end

Up to this point, front-end did not suspect that there could be classes which
have both a class object and a package for static members. Since this became
possible for enums loaded from Java binaries (enum entries and valueOf()/
values() are placed into the class object, and every other static member into
the package), we adjust the corresponding scope to also include members from
the corresponding package

 #KT-2990 Fixed

compiler/testData/codegen/boxWithJava/enum/staticField.kt

@@ -0,0 +1,12 @@
+import test.staticField as E
+
+fun box(): String {
+    val instances = E.INSTANCES
+    if (E.foo != 42)
+        return "Wrong foo ${E.foo}"
+    if (instances.size() != 1)
+        return "Wrong size ${instances.size()}"
+    if (E.INSTANCES.iterator().next() != E.INSTANCE)
+        return "Wrong instance ${E.INSTANCES.iterator().next()}"
+    return "OK"
+}