[Comments] Trailing single-line comments are wrapped to the next line

I had a bit of code where a trailing comment was moved to the next line when there’s another statement after the function. This can cause confusion since it requires you to read the comment to know whether it applies to the line before or after and it looks like it would actually cause things like // eslint-disable-line to apply to a different statement.

function foobar() {
	var foo = bar;
	var bar = fooBarBaaz(); // foo all the bars

	var baaz = 'quux';
}

becomes:

function foobar() {
  var foo = bar;
  var bar = fooBarBaaz();
  // foo all the bars
  var baaz = "quux";
}

This does not happen if the comment is on the last line of a function.

[jlongster]

Comments are probably where most of the subtle bugs are right now. They’re pretty difficult to get right, but this is definitely problematic. I think it’ll take a few weeks to sort out these kinds of bugs, but we’ll get there.

[jlongster]

See above PR