[FE 1.0] Report USELESS_IS_CHECK if is expression is always false

^KT-47684 Fixed

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

@@ -0,0 +1,69 @@
+abstract class A
+abstract class B : A()
+
+abstract class AS
+abstract class BS : AS()
+
+interface AI
+interface BI : AI
+
+fun test_1(a: A) {
+    <!USELESS_IS_CHECK!>a is A<!> // always true
+    a is B
+
+    a is AS // always false
+    a is BS // always false
+
+    a is AI
+    a is BI
+}
+
+fun test_2(a: A) {
+    <!USELESS_IS_CHECK!>a !is A<!> // always false
+    a !is B
+
+    a !is AS // always true
+    a !is BS // always true
+
+    a !is AI
+    a !is BI
+}
+
+fun test_3(a: Any) {
+    if (a is A) {
+        <!USELESS_IS_CHECK!>a is A<!> // always true
+        a is B
+
+        a is AS // always false
+        a is BS // always false
+
+        a is AI
+        a is BI
+    }
+}
+
+fun test_4(a: A) {
+    when (a) {
+        <!USELESS_IS_CHECK!>is A<!> -> {} // always true
+        is B -> {}
+
+        is AS -> {} // always false
+        is BS -> {} // always false
+
+        is AI -> {}
+        is BI -> {}
+    }
+}
+
+fun test_5(a: A) {
+    when (a) {
+        <!USELESS_IS_CHECK!>!is A<!> -> {} // always false
+        !is B -> {}
+
+        !is AS -> {} // always true
+        !is BS -> {} // here a may has type AS (by data flow)
+
+        !is AI -> {}
+        !is BI -> {}
+    }
+}