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

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

@@ -0,0 +1,14 @@
+fun foo(x: String): String? = x
+
+fun calc(x: String?, y: String?): Int {
+    do {
+        // Smart cast because of x!! in receiver
+        foo(x!!)?.subSequence(0, if (x.length > 0) 5 else break)
+        y!!.length
+        // x is not null in condition but we do not see it yet
+    } while (x.length > 0)
+    // y is nullable because of break
+    y.length
+    // x is not null, at least in theory
+    return x.length
+}