J2K: Get nullability from variable initializer when converting call

#KT-11534 In Progress

j2k/testData/fileOrElement/nullability/nullableInitializer4.kt

@@ -0,0 +1,24 @@
+// ERROR: Type mismatch: inferred type is String? but String was expected
+class TestJava {
+    private var notNullInitializerFieldNullableUsage = "aaa"
+    private var notNullInitializerFieldNotNullUsage = "aaa"
+
+    private var nullInitializerFieldNullableUsage: String? = null
+    private var nullInitializerFieldNotNullUsage: String? = null
+
+    fun testNotNull(obj: Any?) {
+        if (true) {
+            notNullInitializerFieldNullableUsage = obj as String?
+            notNullInitializerFieldNotNullUsage = "str"
+
+            notNullInitializerFieldNullableUsage[1]
+            notNullInitializerFieldNotNullUsage[1]
+        } else {
+            nullInitializerFieldNullableUsage = obj as String?
+            nullInitializerFieldNotNullUsage = "str"
+
+            nullInitializerFieldNullableUsage!![1]
+            nullInitializerFieldNotNullUsage!![1]
+        }
+    }
+}