[FIR] Disable failing blackbox codegen tests for FIR.

compiler/testData/codegen/box/labels/controlLabelClashesWithFuncitonName.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_FIR: JVM_IR
 fun test1(): Boolean {
     test1@ for(i in 1..2) {
         continue@test1

compiler/testData/codegen/box/labels/infixCallLabelling.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_FIR: JVM_IR
 fun test(x: Int): Int {
     x myMap {
         return@myMap

compiler/testData/codegen/box/labels/labeledDeclarations.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_FIR: JVM_IR
 data class A(val a: Int, val b: Int)
 
 fun box() : String

compiler/testData/codegen/box/labels/propertyAccessor.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_FIR: JVM_IR
 val Int.getter: Int
     get() {
         return this@getter

compiler/testData/codegen/box/labels/propertyAccessorFunctionLiteral.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_FIR: JVM_IR
 val Int.getter: Int
     get() {
         return {

compiler/testData/codegen/box/labels/propertyAccessorInnerExtensionFun.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_FIR: JVM_IR
 val Int.getter: Int
     get() {
         val extFun: Int.() -> Int = {

compiler/testData/codegen/box/labels/propertyAccessorObject.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_FIR: JVM_IR
 interface Base {
     fun foo(): Int
 }

compiler/testData/codegen/box/labels/propertyInClassAccessor.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_FIR: JVM_IR
 class Test {
     val Int.innerGetter: Int
         get() {