IR: consolidate generation of synthetic members for data class

compiler/testData/codegen/box/dataClasses/toString/alreadyDeclared.kt

@@ -1,3 +1,4 @@
+// IGNORE_BACKEND_FIR: JVM_IR
 data class A(val x: Int) {
   override fun toString(): String = "!"
 }

compiler/testData/codegen/box/dataClasses/toString/alreadyDeclaredWrongSignature.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 // TARGET_BACKEND: JVM
 
 // WITH_RUNTIME

compiler/testData/codegen/box/dataClasses/toString/arrayParams.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 // IGNORE_BACKEND: JS_IR
 // TODO: muted automatically, investigate should it be ran for JS or not
 // IGNORE_BACKEND: JS

compiler/testData/codegen/box/dataClasses/toString/changingVarParam.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 data class A(var string: String)
 
 fun box(): String {

compiler/testData/codegen/box/dataClasses/toString/genericParam.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 data class A<T>(val x: T)
 
 fun box(): String {

compiler/testData/codegen/box/dataClasses/toString/mixedParams.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 data class A(var x: Int, val z: Int?)
 
 fun box(): String {

compiler/testData/codegen/box/dataClasses/toString/unitComponent.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 data class A(val x: Unit)
 
 fun box(): String {