Syntax highlighting for #_ forms comments out next form

[danielcompton]

Expected behavior

When using the #_ reader macro, you can chain several together. This lets you comment out more than one form at a time. However the Cider syntax highlighting uses the first #_ to comment out the second one. For example:

In Cursive:

## Actual behavior

In emacs:

## Steps to reproduce the problem

#_ #_ :a :b

Environment & Version information

clojure-mode version information

clojure-mode (version 5.5.2)

Emacs version

25.1.50.1

Operating system

OS X 10.11.6

Carried over from https://github.com/clojure-emacs/cider/issues/1822

[MalloZup]

autogenerated with https://github.com/MalloZup/doghub: issue inactive since 450 days. Please update the issue or close it

[yuhan0]

This should be closed by #545 too :)