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

compiler/testData/diagnostics/tests/annotations/onMultiDeclaration.fir.kt

@@ -0,0 +1,7 @@
+fun test(): Any? {
+    @ann val (a, b) = P(1, 1)
+    return a + b
+}
+
+annotation class ann
+data class P(val a: Int, val b: Int)