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

compiler/testData/diagnostics/tests/controlFlowAnalysis/deadCode/deadCodeInLoops.fir.kt

@@ -0,0 +1,21 @@
+fun testFor() {
+    operator fun Nothing.iterator() = (0..1).iterator()
+
+    for (i in todo()) {}
+}
+
+fun testWhile() {
+    while (todo()) {
+    }
+}
+
+fun testDoWhile() {
+    do {
+
+    } while(todo())
+
+    bar()
+}
+
+fun todo(): Nothing = throw Exception()
+fun bar() {}