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

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

@@ -0,0 +1,12 @@
+class Coll {
+  operator fun iterator(): It? = null
+}
+
+class It {
+  operator fun next() = 1
+  operator fun hasNext() = false
+}
+
+fun test() {
+  <!INAPPLICABLE_CANDIDATE, INAPPLICABLE_CANDIDATE!>for (x in Coll()) {}<!>
+}