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

compiler/testData/diagnostics/tests/duplicateJvmSignature/functionAndProperty/functionAndVar.fir.kt

@@ -0,0 +1,8 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+class C {
+    fun setX(x: Int) {}
+
+    var x: Int = 1
+        set(v) {}
+}