JS backend: made as intrinsic map accessing methods and fixed accessing to native map.

js/js.translator/testFiles/native/cases/kt2323.kt

@@ -0,0 +1,13 @@
+package foo
+
+import java.util.*
+
+native
+val classes: Map<String, Any> = noImpl
+native
+val classesMutable: HashMap<String, String> = noImpl
+
+fun box(): Boolean {
+    classesMutable["why"] = "?"
+    return classes["answer"] == 42 && classesMutable["why"] == "?"
+}

js/js.translator/testFiles/native/native/kt2323.js

@@ -0,0 +1,16 @@
+/*
+ * Copyright 2010-2013 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+var classes = {"answer": 42}, classesMutable = {};