Merge branch 'sh-fix-slow-partial-rendering' into 'master'
Fix slow performance with compiling HAML templates
Closes gitlab-ee#11198
See merge request gitlab-org/gitlab-ce!27782
(cherry picked from commit fe45f544)
b02458ef Fix slow performance with compiling HAML templates
fad99d93 Add Rubocop rule to ban include ActionView::Context