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

compiler/testData/diagnostics/tests/smartCasts/smartCastAndArgumentApproximation.fir.kt

@@ -0,0 +1,8 @@
+/*
+    Here element has type Captured(*) because of resolution for `iterator()` on this.
+    and where we resolve `destination.add(element)` we approximate element to `Any` with smart cast to `R`.
+ */
+inline fun <reified R, C : MutableCollection<in R>> Array<*>.filterIsInstanceTo(destination: C): C {
+    for (element in this) if (element is R) destination.add(element)
+    return destination
+}