KT-13440 Bound callable references in reflection

compiler/testData/codegen/box/reflection/call/bound/extensionFunction.kt

@@ -0,0 +1,12 @@
+// TODO: investigate should it be ran for JS or not
+// IGNORE_BACKEND: JS
+
+// WITH_REFLECT
+
+import kotlin.reflect.*
+
+fun String.foo(x: String) = this + x
+fun String?.bar(x: String) = x
+
+fun box() =
+        (""::foo).call("O") + (null::bar).call("K")