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

compiler/testData/diagnostics/tests/annotations/rendering/unusedValue.fir.kt

@@ -0,0 +1,12 @@
+// !RENDER_DIAGNOSTICS_MESSAGES
+// !DIAGNOSTICS: -ASSIGNED_BUT_NEVER_ACCESSED_VARIABLE
+
+@Target(AnnotationTarget.PROPERTY,  AnnotationTarget.FUNCTION, AnnotationTarget.TYPE,  AnnotationTarget.LOCAL_VARIABLE)
+annotation class A
+
+@A
+fun test() {
+    @A
+    var b: @A Int = 0
+    b = 15
+}