Serialize/Deserialize const modifier

compiler/testData/loadJava/compiledKotlin/prop/Const.kt

@@ -0,0 +1,14 @@
+//ALLOW_AST_ACCESS
+package test
+
+const private val topLevel = 1
+
+object A {
+    const protected val inObject = 2
+}
+
+class B {
+    companion object {
+        const val inCompanion = 3
+    }
+}