Add regression test for KT-51254

#KT-51254 Fixed

compiler/testData/codegen/box/inlineClasses/kt51254.kt

@@ -0,0 +1,19 @@
+// WITH_STDLIB
+// IGNORE_BACKEND: JVM, WASM, JS, JS_IR
+
+@JvmInline
+value class Inlined(val value: Int)
+
+sealed interface A <T: Inlined> {
+    fun foo(i: T?)
+}
+
+class B : A<Nothing> {
+    override fun foo(i: Nothing?) {}
+}
+
+fun box(): String {
+    val a: A<*> = B()
+    a.foo(null)
+    return "OK"
+}