Introduces a number of micro-level optimizations in the Tag Processor to improve token-scanning performance. Should contain no functional changes. Based on benchmarking against a list of the 100 most-visited websites, these changes result in an average improvement in performance of the Tag Processor for scanning tags from between 3.5% and 7.5%. Developed in https://github.com/WordPress/wordpress-develop/pull/6890 Discussed in https://core.trac.wordpress.org/ticket/61545 Follow-up to [55203]. See #61545. Built from https://develop.svn.wordpress.org/trunk@58613 git-svn-id: http://core.svn.wordpress.org/trunk@58046 1a063a9b-81f0-0310-95a4-ce76da25c4cd