Store refactoring

#KT-1213 Fixed

compiler/testData/codegen/box/staticFields/classObjectInc.kt

@@ -0,0 +1,17 @@
+
+class A {
+    class object {
+        private var r: Int = 1;
+
+        fun a(): Int {
+            r++
+            ++r
+            return r
+        }
+    }
+}
+
+fun box() : String {
+    val p = A.a()
+    return if (p == 3) return "OK" else "fail"
+}