DescriptorRenderer: fix rendering of functional types in receivers

compiler/testData/renderer/FunctionTypesInSignature.kt

@@ -0,0 +1,42 @@
+package test
+
+fun Function0<Unit>.f1(f: Function0<Unit>): Function0<Int> {
+}
+
+fun (() -> Unit).f2(f: Function0<Unit>) : Function0<Int> {
+}
+
+fun ((() -> Unit) -> Unit).f3(f: Function0<Function0<Unit>>) : Function0<Function0<Int>> {
+}
+
+fun Function0<() -> Unit>.f4(f: (() -> Unit, () -> Unit) -> Unit): Function1<() -> Unit, () -> Unit> {
+}
+
+fun Function0<(() -> Unit) -> (() -> Unit)>.f5() {
+}
+
+fun Function0<(() -> Unit) -> (() -> Unit)>?.f6() {
+}
+
+fun ((Int) -> Unit)?.f7() {
+}
+
+fun <T> (T.(Int) -> Unit).f8() {
+}
+
+val Function0<(() -> Unit) -> (() -> Unit)>.p: Unit = Unit
+//package test
+//internal fun (() -> kotlin.Unit).f1(f: () -> kotlin.Unit): () -> kotlin.Int defined in test
+//value-parameter val f: () -> kotlin.Unit defined in test.f1
+//internal fun (() -> kotlin.Unit).f2(f: () -> kotlin.Unit): () -> kotlin.Int defined in test
+//value-parameter val f: () -> kotlin.Unit defined in test.f2
+//internal fun ((() -> kotlin.Unit) -> kotlin.Unit).f3(f: () -> () -> kotlin.Unit): () -> () -> kotlin.Int defined in test
+//value-parameter val f: () -> () -> kotlin.Unit defined in test.f3
+//internal fun (() -> () -> kotlin.Unit).f4(f: (() -> kotlin.Unit, () -> kotlin.Unit) -> kotlin.Unit): (() -> kotlin.Unit) -> () -> kotlin.Unit defined in test
+//value-parameter val f: (() -> kotlin.Unit, () -> kotlin.Unit) -> kotlin.Unit defined in test.f4
+//internal fun (() -> (() -> kotlin.Unit) -> () -> kotlin.Unit).f5(): kotlin.Unit defined in test
+//internal fun (() -> (() -> kotlin.Unit) -> () -> kotlin.Unit)?.f6(): kotlin.Unit defined in test
+//internal fun ((kotlin.Int) -> kotlin.Unit)?.f7(): kotlin.Unit defined in test
+//internal fun <T> (T.(kotlin.Int) -> kotlin.Unit).f8(): kotlin.Unit defined in test
+//<T> defined in test.f8
+//internal val (() -> (() -> kotlin.Unit) -> () -> kotlin.Unit).p: kotlin.Unit defined in test