[FIR] Disable failing blackbox codegen tests for FIR.

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

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_FIR: JVM_IR
 val foo1 = fun Any.(): String {
 return  "239" + this
 }

compiler/testData/codegen/box/functions/functionExpression/functionExpressionWithThisReference.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_FIR: JVM_IR
 // IGNORE_BACKEND: JVM_IR
 // For JVM_IR, NewInference is needed because of KT-26531. See functionExpressionWithThisReferenceNI.kt
 

compiler/testData/codegen/box/functions/functionExpression/functionExpressionWithThisReferenceNI.kt

@@ -1,4 +1,5 @@
 // !LANGUAGE: +NewInference
+// IGNORE_BACKEND_FIR: JVM_IR
 // NewInference needed because of KT-26531
 
 fun Int.thisRef1() = fun () = this

compiler/testData/codegen/box/functions/functionExpression/functionLiteralExpression.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_FIR: JVM_IR
 fun Any.foo1() : ()-> String {
   return { "239" + this }
 }

compiler/testData/codegen/box/functions/functionExpression/insideGenericLambda.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_FIR: JVM_IR
 fun <T> block(block: () -> T): T = block()
 fun foo() {}
 

compiler/testData/codegen/box/functions/functionExpression/underscoreParameters.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_FIR: JVM_IR
 fun foo(block: (String, String, String) -> String): String = block("O", "fail", "K")
 
 fun box() = foo(fun(x: String, _: String, y: String) = x + y)