[FIR] Disable failing blackbox codegen tests for FIR.

compiler/testData/codegen/box/safeCall/genericNull.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_FIR: JVM_IR
 fun <T : Number?> foo(t: T) {
     t?.toInt()
 }

compiler/testData/codegen/box/safeCall/kt1572.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_FIR: JVM_IR
 //KT-1572 Frontend doesn't mark all vars included in closure as refs.
 
 class A(val t : Int) {}

compiler/testData/codegen/box/safeCall/kt245.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_FIR: JVM_IR
 // KJS_WITH_FULL_RUNTIME
 fun foo() {
     val l = ArrayList<Int>(2)

compiler/testData/codegen/box/safeCall/kt247.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_FIR: JVM_IR
 fun t1() : Boolean {
     val s1 : String? = "sff"
     val s2 : String? = null

compiler/testData/codegen/box/safeCall/kt3430.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_FIR: JVM_IR
 fun f(b : Int.(Int)->Int) = 1?.b(1)
 
 fun box(): String {

compiler/testData/codegen/box/safeCall/kt4733.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_FIR: JVM_IR
 class Test {
     val Long.foo: Long
         get() = this + 1

compiler/testData/codegen/box/safeCall/primitiveEqSafeCall.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_FIR: JVM_IR
 fun Long.id() = this
 
 fun String.drop2() = if (length >= 2) subSequence(2, length) else null

compiler/testData/codegen/box/safeCall/primitiveNotEqSafeCall.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_FIR: JVM_IR
 fun Long.id() = this
 
 fun String.drop2() = if (length >= 2) subSequence(2, length) else null

compiler/testData/codegen/box/safeCall/safeCallEqPrimitive.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_FIR: JVM_IR
 fun Long.id() = this
 
 fun String.drop2() = if (length >= 2) subSequence(2, length) else null

compiler/testData/codegen/box/safeCall/safeCallNotEqPrimitive.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_FIR: JVM_IR
 fun Long.id() = this
 
 fun String.drop2() = if (length >= 2) subSequence(2, length) else null

compiler/testData/codegen/box/safeCall/safeCallOnLong.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_FIR: JVM_IR
 fun f(b : Long.(Long)->Long) = 1L?.b(2L)
 
 fun box(): String {