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

compiler/testData/diagnostics/tests/smartCasts/loops/ifBreakExprInsideWhileTrue.fir.kt

@@ -0,0 +1,10 @@
+public fun foo(x: String?): Int {
+    while (true) {
+        // After the check, smart cast should work
+        val y = if (x == null) break else x
+        // y is not null in both branches
+        y.length
+    }
+    // x is null because of the break
+    return x.<!INAPPLICABLE_CANDIDATE!>length<!>
+}