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

compiler/testData/diagnostics/tests/overload/UnsubstitutedJavaGenetics.fir.kt

@@ -0,0 +1,17 @@
+// !DIAGNOSTICS: -UNUSED_VARIABLE
+
+// FILE: Base.java
+public interface Base {
+    <T> String foo(T a);
+    <T> int foo(T a, Object... args);
+}
+
+// FILE: Derived.java
+public interface Derived extends Base {
+}
+
+// FILE: test.kt
+fun testDerived(base: Base, derived: Derived) {
+    val test1: String = base.foo("")
+    val test2: String = derived.foo("")
+}