Fix tests: "infix modifier required" and "operator modifier required" errors

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

@@ -1,7 +1,7 @@
 import java.util.ArrayList
 
-fun ArrayList<String>.get(index1: Int, index2: Int) = this[index1 + index2]
-fun ArrayList<String>.set(index1: Int, index2: Int, elem: String) {
+operator fun ArrayList<String>.get(index1: Int, index2: Int) = this[index1 + index2]
+operator fun ArrayList<String>.set(index1: Int, index2: Int, elem: String) {
     this[index1 + index2] = elem
 }
 

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

@@ -1,7 +1,7 @@
 import java.util.ArrayList
 
-fun ArrayList<String>.get(index1: Int, index2: Int) = this[index1 + index2]
-fun ArrayList<String>.set(index1: Int, index2: Int, elem: String) {
+operator fun ArrayList<String>.get(index1: Int, index2: Int) = this[index1 + index2]
+operator fun ArrayList<String>.set(index1: Int, index2: Int, elem: String) {
     this[index1 + index2] = elem
 }
 

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

@@ -1,6 +1,6 @@
 import java.util.HashMap
 
-fun HashMap<String, Int?>.set(index: String, elem: Int?) {
+operator fun HashMap<String, Int?>.set(index: String, elem: Int?) {
     this.put(index, elem)
 }
 

compiler/testData/codegen/box/arrays/kt238.kt

@@ -43,16 +43,16 @@ fun box() : String {
 }
 
 class StrangeArray<T>(size: Int, private var defaultValue: T) {
-    fun get(index: Int): T = defaultValue
-    fun set(index: Int, v: T) {
+    operator fun get(index: Int): T = defaultValue
+    operator fun set(index: Int, v: T) {
         defaultValue = v
     }
 }
 
 class StrangeIntArray(size: Int) {
     private var defaultValue = 0
-    fun get(index: Int): Int = defaultValue
-    fun set(index: Int, v: Int) {
+    operator fun get(index: Int): Int = defaultValue
+    operator fun set(index: Int, v: Int) {
         defaultValue = v
     }
 }

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

@@ -1,8 +1,8 @@
-fun String.get(vararg value: Any) : String {
+operator 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 {
+operator fun Int.get(vararg value: Any) : Int {
     return if (value[0] == 44 && value[1] == "example") 1 else 0
 }
 fun main(args: Array<String>) {

compiler/testData/codegen/box/arrays/kt950.kt

@@ -1,6 +1,6 @@
 import java.util.*
 
-fun <K, V> MutableMap<K, V>.set(k : K, v : V) = put(k, v)
+operator fun <K, V> MutableMap<K, V>.set(k : K, v : V) = put(k, v)
 
 fun box() : String {
     val map = HashMap<String,String>()

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

@@ -1,5 +1,5 @@
-fun IntArray.set(index: Long, elem: Int) { this[index.toInt()] = elem }
-fun IntArray.get(index: Long) = this[index.toInt()]
+operator fun IntArray.set(index: Long, elem: Int) { this[index.toInt()] = elem }
+operator fun IntArray.get(index: Long) = this[index.toInt()]
 
 fun box(): String {
     var l = IntArray(1)