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

compiler/testData/diagnostics/tests/numbers/numberAsUnionAndIntersection.fir.kt

@@ -1,22 +0,0 @@
-// !LANGUAGE: +NewInference
-// !DIAGNOSTICS: -UNUSED_PARAMETER
-
-fun test(numbers: List<Number>) {
-
-    // Short <: R, ILT <: R => CST(Short, ILT) = Short
-    // => we should pick Short in such situation as it more specific
-    shortExpected { getShort() ?: 1 }
-
-    // Short <: R, ILT <: R, R <: Comparable<R> =>
-    // Short <: Comparable<R>, ILT <: Comparable<R> =>
-    // Comparable<Short> <: Comparable<R>, Comparable<ILT> <: Comparable<R> =>
-    // R <: Short, R <: ILT =>
-    // R := Short, R := ILT
-    // => we should pick Short as it more specific
-    shortComparable { getShort() ?: 1 }
-}
-
-fun <R> shortExpected(f: () -> R) {}
-fun <R : Comparable<R>> shortComparable(f: () -> R) {}
-
-fun getShort(): Short? = 1

compiler/testData/diagnostics/tests/numbers/numberAsUnionAndIntersection.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // !LANGUAGE: +NewInference
 // !DIAGNOSTICS: -UNUSED_PARAMETER