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

compiler/testData/diagnostics/tests/smartCasts/varnotnull/unnecessaryWithMap.fir.kt

@@ -0,0 +1,20 @@
+// !WITH_NEW_INFERENCE
+fun create(): Map<String, String> = null!!
+
+operator fun <K, V> Map<K, V>.iterator(): Iterator<Map.Entry<K, V>> = null!!
+
+operator fun <K, V> Map.Entry<K, V>.component1() = key
+
+operator fun <K, V> Map.Entry<K, V>.component2() = value
+
+class MyClass {
+    private var m: Map<String, String>? = null
+    fun foo(): Int {
+        var res = 0
+        m = create()
+        // See KT-7428
+        for ((k, v) in m)
+            res += (k.length + v.length)
+        return res
+    }
+}