Redirect does many unecessary entity_load() when having many redirects with query strings

I have many thousands of redirects of this type: <front>/?p=4567

This works fine, except that on the front page of the site, Redirects loads all of these redirects via redirect_load() and entity_load(), even though all of them have query parameters in the source_options, and I am visiting the front page without any query parameters. So this seems very inefficient.

My solution to this is to adjust redirect_init() and redirect_get_current_redirect() to simply never redirect from the front page when we also do not have any query parameters in the URL. See below for patch.