Add codegen tests for old behavior of null checks

#KT-22275

compiler/testData/codegen/box/nullCheckOptimization/exclExclThrowsKnpe_1_3.kt

@@ -0,0 +1,15 @@
+// !API_VERSION: 1.3
+// WITH_RUNTIME
+// IGNORE_BACKEND_FIR: JVM_IR
+// TARGET_BACKEND: JVM
+
+fun box(): String {
+    val s: String? = null
+    try {
+        s!!
+        return "Fail: KNPE should have been thrown"
+    } catch (e: Throwable) {
+        if (e::class != KotlinNullPointerException::class) return "Fail: exception class should be KNPE: ${e::class}"
+        return "OK"
+    }
+}