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-object-rest-spread/test/fixtures/object-rest/variable-destructuring/expected.js

@@ -1,29 +1,52 @@
 var z = {};
 var x = babelHelpers.objectWithoutProperties(z, []);
-var a = babelHelpers.objectWithoutProperties({ a: 1 }, []);
+var a = babelHelpers.objectWithoutProperties({
+  a: 1
+}, []);
 var x = babelHelpers.objectWithoutProperties(a.b, []);
 var x = babelHelpers.objectWithoutProperties(a(), []);
-var { x1 } = z,
+var {
+  x1
+} = z,
     y1 = babelHelpers.objectWithoutProperties(z, ["x1"]);
 x1++;
-var { [a]: b } = z,
+var {
+  [a]: b
+} = z,
     c = babelHelpers.objectWithoutProperties(z, [a]);
-var { x1 } = z,
+var {
+  x1
+} = z,
     y1 = babelHelpers.objectWithoutProperties(z, ["x1"]);
-let { x2, y2 } = z,
-    z2 = babelHelpers.objectWithoutProperties(z, ["x2", "y2"]);
-const { w3, x3, y3 } = z,
-      z4 = babelHelpers.objectWithoutProperties(z, ["w3", "x3", "y3"]);
-
 let {
-  x: { a: xa, [d]: f }
+  x2,
+  y2
+} = z,
+    z2 = babelHelpers.objectWithoutProperties(z, ["x2", "y2"]);
+const {
+  w3,
+  x3,
+  y3
+} = z,
+      z4 = babelHelpers.objectWithoutProperties(z, ["w3", "x3", "y3"]);
+let {
+  x: {
+    a: xa,
+    [d]: f
+  }
 } = complex,
     asdf = babelHelpers.objectWithoutProperties(complex.x, ["a", d]),
     d = babelHelpers.objectWithoutProperties(complex.y, []),
     g = babelHelpers.objectWithoutProperties(complex, ["x"]);
-
 let {} = z,
     y4 = babelHelpers.objectWithoutProperties(z.x4, []);
-
-var { z } = babelHelpers.objectWithoutProperties({ z: 1 }, []);
-var { x = 5 } = babelHelpers.objectWithoutProperties({ x: 1 }, []);
+var {
+  z
+} = babelHelpers.objectWithoutProperties({
+  z: 1
+}, []);
+var {
+  x = 5
+} = babelHelpers.objectWithoutProperties({
+  x: 1
+}, []);