Introduce FIR_IDENTICAL for FIR vs old frontend tests #KT-36879 Fixed

compiler/testData/diagnostics/tests/lateinit/local/localLateinit.fir.kt

@@ -1,7 +0,0 @@
-// !LANGUAGE: +LateinitLocalVariables
-
-fun test() {
-    lateinit var s: String
-    s = ""
-    s.length
-}

compiler/testData/diagnostics/tests/lateinit/local/localLateinit.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // !LANGUAGE: +LateinitLocalVariables
 
 fun test() {

compiler/testData/diagnostics/tests/lateinit/local/uninitialized.fir.kt

@@ -1,24 +0,0 @@
-// !LANGUAGE: +LateinitLocalVariables
-
-fun test1() {
-    lateinit var s: String
-    s.length
-}
-
-fun test2() {
-    lateinit var s: String
-    run {
-        s = ""
-    }
-    s.length
-}
-
-fun almostAlwaysTrue(): Boolean = true
-
-fun test3() {
-    lateinit var s: String
-    if (almostAlwaysTrue()) {
-        s = ""
-    }
-    s.length
-}

compiler/testData/diagnostics/tests/lateinit/local/uninitialized.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // !LANGUAGE: +LateinitLocalVariables
 
 fun test1() {