KT-4348: Array access operator overloading doesn't work with vararg's

#KT-4348 Fixed

compiler/testData/codegen/box/arrays/kt4348.kt

@@ -0,0 +1,17 @@
+fun String.get(vararg value: Any) : String {
+    return if (value[0] == 44 && value[1] == "example") "OK" else "fail"
+}
+
+fun Int.get(vararg value: Any) : Int {
+    return if (value[0] == 44 && value[1] == "example") 1 else 0
+}
+fun main(args: Array<String>) {
+    12  [44, "example"]
+}
+
+fun box(): String {
+    if ("foo" [44, "example"] != "OK") return "fail1"
+    if (11 [44, "example"] != 1) return "fail2"
+
+    return "OK"
+}