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

compiler/testData/diagnostics/tests/controlStructures/forLoopWithNullableRange.fir.kt

@@ -0,0 +1,16 @@
+class Coll {
+  operator fun iterator(): It = It()
+}
+
+class It {
+  operator fun next() = 1
+  operator fun hasNext() = false
+}
+
+fun test(c: Coll?) {
+  <!INAPPLICABLE_CANDIDATE, UNRESOLVED_REFERENCE, UNRESOLVED_REFERENCE!>for (x in c) {}<!>
+
+  if (c != null) {
+    for(x in c) {}
+  }
+}