[FIR] Add UNCHECKED_CAST

Regenerate diagnostics code

compiler/testData/diagnostics/tests/cast/AsArray.fir.kt

@@ -1 +0,0 @@
-fun f(x: Any) = x as Array<String>

compiler/testData/diagnostics/tests/cast/AsArray.kt

@@ -1 +1,2 @@
+// FIR_IDENTICAL
 fun f(x: Any) = x <!UNCHECKED_CAST!>as Array<String><!>

compiler/testData/diagnostics/tests/cast/AsErasedError.fir.kt

@@ -1,2 +0,0 @@
-
-fun ff(c: MutableCollection<String>) = c as MutableList<Int>

compiler/testData/diagnostics/tests/cast/AsErasedError.kt

@@ -1,2 +1,3 @@
+// FIR_IDENTICAL
 
 fun ff(c: MutableCollection<String>) = c <!UNCHECKED_CAST!>as MutableList<Int><!>

compiler/testData/diagnostics/tests/cast/AsErasedWarning.fir.kt

@@ -1,2 +0,0 @@
-
-fun ff(a: Any) = a as MutableList<String>

compiler/testData/diagnostics/tests/cast/AsErasedWarning.kt

@@ -1,2 +1,3 @@
+// FIR_IDENTICAL
 
 fun ff(a: Any) = a <!UNCHECKED_CAST!>as MutableList<String><!>

compiler/testData/diagnostics/tests/cast/AsWithOtherParameter.fir.kt

@@ -1,34 +0,0 @@
-// See also: KT-6611 (cast can never succeed: Class<T> -> Class<Any>)
-
-class Class<T>(val name: String, val instance: T)
-
-fun <T> test(clazz: Class<T>) {
-    println((clazz as Class<Any>).name)
-}
-
-fun use() {
-    test(Class("String", ""))
-}
-
-fun checkArrays(): Array<Any> {
-    val someArray = arrayOfNulls<Any>(5)
-    someArray as Array<Int>
-    return someArray as Array<Any>
-}
-
-class Wrapper<T>(val x: T)
-
-fun checkArrays2(): Array<Wrapper<String>> {
-    val someArray = arrayOf(Wrapper(1), Wrapper(2))
-    return someArray as Array<Wrapper<String>>
-}
-
-fun checkArrays3() {
-    val someArray = arrayOfNulls<String>(1)
-    someArray as Array<Any>
-    val intArray = arrayOfNulls<Int>(1)
-    intArray as Array<Any>
-}
-
-fun println(s: String) = s
-

compiler/testData/diagnostics/tests/cast/AsWithOtherParameter.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // See also: KT-6611 (cast can never succeed: Class<T> -> Class<Any>)
 
 class Class<T>(val name: String, val instance: T)

compiler/testData/diagnostics/tests/cast/IsErasedUpcastToNonReified.fir.kt

@@ -10,9 +10,9 @@ fun <T, S : T> test(x: T?, y: S, z: T) {
     <!USELESS_IS_CHECK!>z is T<!>
     <!USELESS_IS_CHECK!>z is T?<!>
 
-    null as T
+    null <!UNCHECKED_CAST!>as T<!>
     null as T?
-    null as S
+    null <!UNCHECKED_CAST!>as S<!>
 }
 
 inline fun <reified T> test(x: T?) {