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-function-bind/test/fixtures/function-bind/static-contexts/expected.js

@@ -1,5 +1,5 @@
 var bar = function () {};
-bar.bind(foo);
 
+bar.bind(foo);
 var foo = {};
-foo.bar.bind(foo);
+foo.bar.bind(foo);