JVM_IR: add accessors for protected members in divergent hierarchies

Class B : A cannot access a protected field of A through a reference to
an instance of C : A.

compiler/testData/codegen/boxAgainstJava/visibility/protectedAndPackage/protectedAccessor.kt

@@ -0,0 +1,21 @@
+// FILE: protectedPack/A.java
+package protectedPack;
+
+public class A {
+    protected final String field;
+
+    public A(String value) {
+        field = value;
+    }
+}
+
+// FILE: B.kt
+import protectedPack.A
+
+class B(value: String) : A(value) {
+    inner class C : A(field) {
+        val result = field
+    }
+}
+
+fun box(): String = B("OK").C().result