Fix compiler tests

compiler/testData/diagnostics/tests/resolve/invoke/errors/invisibleInvoke.kt

@@ -1,7 +1,7 @@
 // !DIAGNOSTICS: -UNUSED_PARAMETER
 
 class My {
-    private fun Int.invoke(s: String) {}
+    private operator fun Int.invoke(s: String) {}
 }
 
 fun My.foo(i: Int) {

compiler/testData/diagnostics/tests/resolve/invoke/errors/invisibleInvoke.txt

@@ -7,5 +7,5 @@ public final class My {
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
-    private final fun kotlin.Int.invoke(/*0*/ s: kotlin.String): kotlin.Unit
+    private final operator fun kotlin.Int.invoke(/*0*/ s: kotlin.String): kotlin.Unit
 }

compiler/testData/diagnostics/tests/resolve/invoke/errors/typeInferenceErrorForInvoke.kt

@@ -2,7 +2,7 @@
 
 class A<T>
 
-fun <T> T.invoke(a: A<T>) {}
+operator fun <T> T.invoke(a: A<T>) {}
 
 fun foo(s: String, ai: A<Int>) {
     1(ai)

compiler/testData/diagnostics/tests/resolve/invoke/errors/typeInferenceErrorForInvoke.txt

@@ -1,7 +1,7 @@
 package
 
 public fun foo(/*0*/ s: kotlin.String, /*1*/ ai: A<kotlin.Int>): kotlin.Unit
-public fun </*0*/ T> T.invoke(/*0*/ a: A<T>): kotlin.Unit
+public operator fun </*0*/ T> T.invoke(/*0*/ a: A<T>): kotlin.Unit
 
 public final class A</*0*/ T> {
     public constructor A</*0*/ T>()

compiler/testData/diagnostics/tests/resolve/invoke/errors/unsafeCallWithInvoke.kt

@@ -1,6 +1,6 @@
 // !DIAGNOSTICS: -UNUSED_PARAMETER
 
-fun String.invoke(i: Int) {}
+operator fun String.invoke(i: Int) {}
 
 fun foo(s: String?) {
     <!UNSAFE_CALL!>s<!>(1)

compiler/testData/diagnostics/tests/resolve/invoke/errors/unsafeCallWithInvoke.txt

@@ -1,4 +1,4 @@
 package
 
 public fun foo(/*0*/ s: kotlin.String?): kotlin.Unit
-public fun kotlin.String.invoke(/*0*/ i: kotlin.Int): kotlin.Unit
+public operator fun kotlin.String.invoke(/*0*/ i: kotlin.Int): kotlin.Unit