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

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

@@ -0,0 +1,12 @@
+fun testIf() {
+    if (todo()) 1 else 2
+}
+
+fun testIf1(b: Boolean) {
+    if (b) todo() else 1
+
+    bar()
+}
+
+fun todo(): Nothing = throw Exception()
+fun bar() {}