[Test] Add test for KT-54645

compiler/testData/codegen/box/companion/kt54645.kt

@@ -0,0 +1,22 @@
+// TARGET_BACKEND: JVM_IR
+// IGNORE_BACKEND_FIR: JVM_IR
+// ISSUE: KT-54645
+
+abstract class Base {
+    open class Nested
+}
+
+sealed class Derived : Base() {
+    open class Nested
+}
+
+class Impl() : Derived() {
+    companion object : Nested()
+}
+
+fun takeDerivedNested(x: Derived.Nested) {}
+
+fun box(): String {
+    takeDerivedNested(Impl)
+    return "OK"
+}