[FIR-TEST] Move analysis tests to separate module

compiler/fir/analysis-tests/testData/resolve/smartcasts/stability/overridenOpenVal.kt

@@ -0,0 +1,16 @@
+// !DUMP_CFG
+open class A(open val x: Any)
+
+class B(x: Any) : A(x) {
+    fun test_1() {
+        if (x is String) {
+            x.length
+        }
+    }
+}
+
+fun test_2(b: B) {
+    if (b.x is String) {
+        b.x.length
+    }
+}