add test files

js/js.translator/testFiles/patternMatching/cases/whenWithIf.kt

@@ -0,0 +1,19 @@
+package foo
+
+fun box() : Boolean {
+
+  var c = when(3) {
+    3 -> 1
+    2 -> 100
+    else -> 100
+  } + when (2) {
+    1 -> 100
+    else -> 1
+  } + when (0) {
+    1 -> if (true) 100 else 100
+      0 -> if (false) {100} else {1}
+    else -> 100
+  }
+
+  return c == 3
+}