[FIR] Ensure KT-64089 works

Make sure SENSELESS_COMPARISON
is absent in this case.

^KT-64089 Obsolete


Merge-request: KT-MR-13754
Merged-by: Nikolay Lunyak <Nikolay.Lunyak@jetbrains.com>

compiler/testData/diagnostics/tests/k2IrParentIssue.kt

@@ -0,0 +1,16 @@
+// FIR_IDENTICAL
+// ISSUE: KT-64089
+
+fun <T> contentReturner(f: () -> T): T {
+    return null <!UNCHECKED_CAST!>as T<!>
+}
+
+fun main(number: Int? = null) {
+    contentReturner {
+        "".apply {
+            number!!
+        }
+    }
+
+    number != null
+}