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

compiler/testData/diagnostics/tests/dataFlowInfoTraversal/IfStatement.fir.kt

@@ -0,0 +1,31 @@
+// !CHECK_TYPE
+
+fun ifThen(x: Int?) {
+    if (x!! == 0) {
+        checkSubtype<Int>(x)
+    }
+    checkSubtype<Int>(x)
+}
+
+fun ifElse(x: Int?) {
+    if (x!! == 0) else {
+        checkSubtype<Int>(x)
+    }
+    checkSubtype<Int>(x)
+}
+
+fun ifThenElse(x: Int?) {
+    if (x!! == 0) {
+        checkSubtype<Int>(x)
+    } else {
+        checkSubtype<Int>(x)
+    }
+    checkSubtype<Int>(x)
+}
+
+fun ifIs(x: Int?, cond: Boolean) {
+    if ((x is Int) == cond) {
+        checkSubtype<Int>(x)
+    }
+    checkSubtype<Int>(x)
+}