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

compiler/testData/codegen/box/functions/invoke/extensionInvokeOnExpr.kt

@@ -1,8 +1,8 @@
 class A
 
 class B {
-    fun A.invoke() = "##"
-    fun A.invoke(i: Int) = "#${i}"
+    operator fun A.invoke() = "##"
+    operator fun A.invoke(i: Int) = "#${i}"
 }
 
 fun foo() = A()

compiler/testData/codegen/box/functions/invoke/invoke.kt

@@ -5,7 +5,7 @@ fun test1(predicate: (Int) -> Int, i: Int) = predicate(i)
 fun test2(predicate: (Int) -> Int, i: Int) = predicate.invoke(i)
 
 class Method {
-    fun invoke(i: Int) = i
+    operator fun invoke(i: Int) = i
 }
 
 fun test3(method: Method, i: Int) = method.invoke(i)
@@ -14,7 +14,7 @@ fun test4(method: Method, i: Int) = method(i)
 
 class Method2 {}
 
-fun Method2.invoke(s: String) = s
+operator fun Method2.invoke(s: String) = s
 
 fun test5(method2: Method2, s: String) = method2(s)
 

compiler/testData/codegen/box/functions/invoke/invokeOnExprByConvention.kt

@@ -2,8 +2,8 @@
 //KT-2728 Can't compile A()()
 
 class A {
-    fun invoke() = "##"
-    fun invoke(i: Int) = "#${i}"
+    operator fun invoke() = "##"
+    operator fun invoke(i: Int) = "#${i}"
 }
 
 fun foo() = A()

compiler/testData/codegen/box/functions/invoke/kt3189.kt

@@ -11,5 +11,5 @@ class Bad(val a: () -> Int) {
 
     fun test(): Int = a()
 
-    fun invoke(): Int = 2
+    operator fun invoke(): Int = 2
 }

compiler/testData/codegen/box/functions/invoke/kt3297.kt

@@ -1,6 +1,6 @@
 //KT-3297 Calling the wrong function inside an extension method to the Function0 class
 
-fun <R> Function0<R>.or(alt: () -> R): R {
+infix fun <R> Function0<R>.or(alt: () -> R): R {
     try {
         return this()
     } catch (e: Exception) {

compiler/testData/codegen/box/functions/invoke/kt3450getAndInvoke.kt

@@ -2,9 +2,9 @@
 
 public class A(val s: String) {
 
-    public fun get(i: Int) : A = A("$s + $i")
+    operator fun get(i: Int) : A = A("$s + $i")
 
-    public fun invoke(builder : A.() -> String): String = builder()
+    operator fun invoke(builder : A.() -> String): String = builder()
 }
 fun x(y : String) : A = A(y)
 

compiler/testData/codegen/box/functions/invoke/kt3631invokeOnString.kt

@@ -1,5 +1,5 @@
 //KT-3631 String.invoke doesn't work with literals
 
-fun String.invoke(i: Int) = "$this$i"
+operator fun String.invoke(i: Int) = "$this$i"
 
 fun box() = if ("a"(12) == "a12") "OK" else "fail"

compiler/testData/codegen/box/functions/invoke/kt3772.kt

@@ -5,7 +5,7 @@ open class A {
 }
 
 class B {
-    fun invoke(f: B.() -> Unit) = 2
+    operator fun invoke(f: B.() -> Unit) = 2
 }
 
 open class C

compiler/testData/codegen/box/functions/invoke/kt3821invokeOnThis.kt

@@ -1,7 +1,7 @@
 //KT-3821 Invoke convention doesn't work for `this`
 
 class A() {
-    fun invoke() = 42
+    operator fun invoke() = 42
     fun foo() = this() // Expecting a function type, but found A
 }