Use built-in uniq() when available.

autoload/gitgutter.vim

@@ -98,6 +98,11 @@ function! s:clear(bufnr)
   call s:reset_tick(a:bufnr)
 endfunction
 
+if exists('*uniq')  " Vim 7.4.218
+  function! s:uniq(list)
+    return uniq(sort(a:list))
+  endfunction
+else
   function! s:uniq(list)
     let processed = []
     for e in a:list
@@ -107,3 +112,4 @@ function! s:uniq(list)
     endfor
     return processed
   endfunction
+endif