[pull] master from ruby:master - #1383
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The fast path is now 4.4x faster, now making it ~2.6x times faster than `CGI.escape_html`, and 26x faster than an equivalent `gsub`. ``` compare-ruby: ruby 4.1.0dev (2026-09-06T11:22:48Z master 13fc4ff) +YJIT +PRISM [arm64-darwin25] built-ruby: ruby 4.1.0dev (2026-09-06T14:39:43Z string-tr-simd e2526ca9ba) +YJIT +PRISM [arm64-darwin25] `` | |compare-ruby|built-ruby| |:------------|-----------:|---------:| |tr_escape | 41.595k| 182.732k| | | -| 4.39x| |gsub_escape | 7.135k| 6.977k| | | 1.02x| -| |cgi_escape | 70.117k| 70.179k| | | -| 1.00x| However, contrary to a lookup table, here the performance is linear with the number of characters to match, hence once we're looking for 16 distinct bytes, the gain compared to the lookup table is down to ~2x.
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