[FIR-TEST] Add new testdata generated after changes in previous commit

compiler/testData/diagnostics/tests/modifiers/const/fromJavaSubclass.fir.kt

@@ -0,0 +1,15 @@
+// FILE: A.java
+
+public class A {
+    public static final String FOO = "foo";
+}
+
+// FILE: B.java
+
+public class B extends A {
+}
+
+// FILE: main.kt
+
+const val K1 = B.FOO
+const val K2 = A.FOO