Introduce FIR_IDENTICAL for FIR vs old frontend tests #KT-36879 Fixed

compiler/testData/diagnostics/tests/operatorsOverloading/kt13349.fir.kt

@@ -1,7 +0,0 @@
-object Foo {
-    operator fun <T> invoke() {}
-}
-
-fun main() {
-    Foo<Int>()
-}

compiler/testData/diagnostics/tests/operatorsOverloading/kt13349.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 object Foo {
     operator fun <T> invoke() {}
 }

compiler/testData/diagnostics/tests/operatorsOverloading/kt3450.fir.kt

@@ -1,23 +0,0 @@
-// !DIAGNOSTICS: -UNUSED_PARAMETER
-
-public class A {
-    public operator fun get(vararg attrs : Pair<String, String>) : A = this
-}
-operator fun String.unaryPlus() : A = A()
-operator fun A.div(s : String) : A = A()
-
-fun test() {
-    (+"node2" / "node3" / "zzz") ["attr" to "value", "a2" to "v2"]
-}
-
-//---------
-class B {
-    public operator fun get(s : String, q : String) : B = this
-    public operator fun get(s : Pair<String, String>) : B = this
-    public operator fun invoke(q : B.() -> Unit) : B = this
-}
-val x = B()["a", "v"]["a" to "b"] {} ["q" to "p"] // does not parses around {}
-
-//from library
-data class Pair<out A, out B> (val first: A, val second: B)
-infix fun <A,B> A.to(that: B) = Pair(this, that)

compiler/testData/diagnostics/tests/operatorsOverloading/kt3450.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // !DIAGNOSTICS: -UNUSED_PARAMETER
 
 public class A {