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

compiler/testData/diagnostics/tests/controlFlowAnalysis/deadCode/deadCodeInUnaryExpr.fir.kt

@@ -0,0 +1,15 @@
+fun testPrefix() {
+    operator fun Any.not() {}
+    !todo()
+}
+
+fun testPostfixWithCall(n: Nothing) {
+    operator fun Nothing.inc(): Nothing = this
+    n++
+}
+
+fun testPostfixSpecial() {
+    todo()!!
+}
+
+fun todo(): Nothing = throw Exception()