[FIR] Disable failing blackbox codegen tests for FIR.

compiler/testData/codegen/box/ir/closureConversion/closureConversion1.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_FIR: JVM_IR
 fun foo(x: String): String {
     fun bar(y: String) = x + y
     return bar("K")

compiler/testData/codegen/box/ir/closureConversion/closureConversion2.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_FIR: JVM_IR
 fun <X : Any> foo(x: X): String {
     fun <Y : Any> bar(y: Y) =
             x.toString() + y.toString()

compiler/testData/codegen/box/ir/closureConversion/closureConversion3.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_FIR: JVM_IR
 fun foo(x: String): String {
     fun bar(y: String): String {
         fun qux(z: String): String =

compiler/testData/codegen/box/ir/closureConversion/closureConversion4.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_FIR: JVM_IR
 fun String.foo(): String {
     fun bar(y: String) = this + y
     return bar("K")

compiler/testData/codegen/box/ir/closureConversion/innerClass1.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_FIR: JVM_IR
 class Outer {
     val x = "O"
     inner class Inner {

compiler/testData/codegen/box/ir/closureConversion/innerClass2.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_FIR: JVM_IR
 class Outer(val x: String) {
     inner class Inner(val y: String) {
         val z = x + y

compiler/testData/codegen/box/ir/closureConversion/mutable1.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_FIR: JVM_IR
 fun box(): String {
     var result = ""
     fun add(s: String) {

compiler/testData/codegen/box/ir/closureConversion/mutablePrimitives.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_FIR: JVM_IR
 fun testBoolean(v: Boolean): Boolean {
     var value = false
     fun setValue(v: Boolean) {