In `wp-admin/theme-editor.php`, `break` is unreachabled after `exit`.

See #27882.

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git-svn-id: http://core.svn.wordpress.org/trunk@28141 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In `core_upgrade_preamble()`, `$alternate` is set then never used.

See #27882.

Built from https://develop.svn.wordpress.org/trunk@28314


git-svn-id: http://core.svn.wordpress.org/trunk@28142 1a063a9b-81f0-0310-95a4-ce76da25c4cd