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/regression/T6984/expected.js

@@ -3,6 +3,7 @@ var _createClass = function () { function defineProperties(target, props) { for
 function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
 
 function _one() {}
+
 function _two() {}
 
 let Test1 = function () {
@@ -23,4 +24,4 @@ let Test1 = function () {
   }]);
 
   return Test1;
-}();
+}();