Take control flow into account for checking fall-through switch branches

#KT-16133 Fixed

j2k/testData/fileOrElement/switch/nestedIfFallback.java

@@ -0,0 +1,13 @@
+//method
+public String foo(int i, int j) {
+    switch (i) {
+        case 0:
+            if (j > 0) {
+                return "1"
+            }
+        case 1:
+            return "2";
+        default:
+            return "3";
+    }
+}