Support default arguments and varargs for callable references

#KT-8834
 #KT-19869
 #KT-25514

compiler/testData/codegen/box/callableReference/varargAndDefaults/varargViewedAsArray.kt

@@ -0,0 +1,10 @@
+// KT-25514 Support usage of function reference with vararg where function of array is expected in new inference
+// IGNORE_BACKEND: JVM_IR, JS_IR
+
+fun foo(x: Int, vararg y: String): String = y[0]
+
+fun useArray(f: (Int, Array<String>) -> String): String = f(1, Array(1) { "OK" })
+
+fun box(): String {
+    return useArray(::foo)
+}