Add tests for issues fixed in JVM IR

Note that KT-30696 is fixed only in the single-module case, and KT-42012
is not fixed fully (see KT-44855).

 #KT-30041
 #KT-30629
 #KT-30696
 #KT-30933
 #KT-32351
 #KT-32749
 #KT-38849
 #KT-42012
 #KT-42990
 #KT-44234
 #KT-44529
 #KT-44631
 #KT-44647

compiler/testData/codegen/box/visibility/protectedAndPackage/kt42012.kt

@@ -0,0 +1,36 @@
+// IGNORE_BACKEND: JVM
+// TARGET_BACKEND: JVM
+// MODULE: lib
+// FILE: test/Parent.java
+
+package test;
+
+public class Parent {
+    protected String qqq = "";
+
+    public String getQqq() {
+        return qqq;
+    }
+}
+
+// MODULE: main(lib)
+// FILE: 1.kt
+
+import test.Parent
+
+open class Child : Parent() {
+    inner class QQQ {
+        fun z(x: Parent?) {
+            x as Child
+            val q = x.qqq
+            x.qqq = q + "OK"
+        }
+    }
+}
+
+fun box(): String {
+    val c = Child()
+    val d = c.QQQ()
+    d.z(c)
+    return c.qqq
+}