[FIR-TEST] Add new testdata generated after changes in previous commit

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

@@ -0,0 +1,17 @@
+// !DIAGNOSTICS: -UNUSED_VARIABLE
+
+fun test() {
+    val a = 1 as Any?
+    val b: Number = 1 as Number
+    val c = null as String?
+    val d: Number = 1 as Int
+}
+
+val c1 get() = 1 as Number
+val c2: Number get() = 1 as Number
+
+val d: Number
+    get() {
+        1 as Number
+        return 1 as Number
+    }