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

compiler/testData/diagnostics/tests/syntheticExtensions/javaProperties/SmartCast.fir.kt

@@ -0,0 +1,28 @@
+// FILE: KotlinFile.kt
+fun foo(o: JavaInterface2): Int {
+    if (o is JavaClass) {
+        o.something++
+        return o.x + o.something2
+    }
+    return 0
+}
+
+// FILE: JavaClass.java
+public abstract class JavaClass extends BaseClass implements JavaInterface {
+    public int getSomething() { return 1; }
+    public void setSomething(int value) { }
+}
+
+// FILE: BaseClass.java
+public abstract class BaseClass implements JavaInterface {
+}
+
+// FILE: JavaInterface.java
+public interface JavaInterface {
+    int getX();
+}
+
+// FILE: JavaInterface2.java
+public interface JavaInterface2 {
+    int getSomething2();
+}