Remove whitespace generation (#5833)

* Remove whitespace generation and rely on default printing

Changes to printing:
* Add newline after last empty SwitchCase
* Add newlines around block comments if they are non-flow comments or contain newlines

* Fix a few more fixtures

packages/babel-plugin-transform-es2015-function-name/test/fixtures/function-name/collisions/expected.js

@@ -1,9 +1,13 @@
 var obj = {
-  search: function search({ search: _search }) {
+  search: function search({
+    search: _search
+  }) {
     console.log(_search);
   }
 };
 
-function search({ search }) {
+function search({
+  search
+}) {
   console.log(search);
-}
+}