K2: handle alias-based types nullability properly in ConeTypeContext

#KT-60154 Fixed

compiler/testData/diagnostics/testsWithStdLib/typealias/nothingTypeAlias.kt

@@ -0,0 +1,22 @@
+// FIR_IDENTICAL
+// ISSUE: KT-60154
+
+// MODULE: lib
+// FILE: lib.kt
+
+interface Column<TData : Any, TValue>
+
+fun <T : Any> column(): Column<T, Void> = TODO()
+
+fun <T : Any> column(id: String): Column<T, String> = TODO()
+
+typealias Void = Nothing?
+
+// MODULE: app(lib)
+// FILE: app.kt
+
+interface RowData<T : Comparable<T>>
+
+typealias ReadonlyArray<T> = Array<out T>
+
+private val ALL_COLUMNS: ReadonlyArray<Column<RowData<*>, *>> = arrayOf(column(id = ""), column())