Prior to this change, each `wp_die()` handler had their own logic for how to parse arguments, causing inconsistencies and even breakage because the arguments possible to pass to `wp_die()` depended on the request context. Passing a `WP_Error` as `$message` for example used to be only support by the default handler, but not the AJAX and XML-RPC handlers.
With the fatal error protection, plus the new `wp_die()` handlers related to that, improving this support and compatibility has become more significant. Therefore this changeset introduces a private `_wp_die_process_input()` function that handles all function parameters consistently.
Props spacedmonkey, flixos90, schlessera.
Fixes#45933. See #44458.
git-svn-id: https://develop.svn.wordpress.org/trunk@44666 602fd350-edb4-49c9-b593-d223f7449a82
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