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

compiler/testData/diagnostics/tests/smartCasts/varnotnull/whileWithBreak.fir.kt

@@ -0,0 +1,17 @@
+data class SomeObject(val n: SomeObject?) {
+    fun doSomething(): Boolean = true
+    fun next(): SomeObject? = n    
+}
+
+fun list(start: SomeObject) {
+    var e: SomeObject? = start
+    while (e != null) {
+        // Smart cast due to the loop condition
+        if (!e.doSomething())
+            break
+        // We still have smart cast here despite of a break
+        e = e.next()
+    }
+    // e can be null because of next()
+    e.doSomething()
+}