FIR: serialize ExtensionFunctionType attribute

compiler/testData/codegen/box/fir/ExtensionAlias.kt

@@ -0,0 +1,24 @@
+// TARGET_BACKEND: JVM
+// MODULE: lib
+// FILE: A.kt
+
+typealias ProcessOverriddenWithBaseScope<D> = String.(D, (D, String) -> Boolean) -> Boolean
+
+// MODULE: main(lib)
+// FILE: B.kt
+
+private data class NumberWithString<N : Number>(val n: N, val s: String)
+
+private fun <N : Number> use(ns: NumberWithString<N>, process: ProcessOverriddenWithBaseScope<N>): String {
+    val (n, s) = ns
+    val result = s.process(n) { _, s ->
+        s == "OK"
+    }
+    return if (result) "OK" else "FAIL"
+}
+
+fun box(): String {
+    return use(NumberWithString(42, "OK")) { n, process ->
+        process(n, "OK")
+    }
+}