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Auto merge of #141678 - Kobzol:revert-141516, r=workingjubilee
Revert "increase perf of charsearcher for single ascii characters"
This reverts commit 245bf503e2a948ac98170516d11df632e85a948b (PR https://github.com/rust-lang/rust/pull/141516).
It caused a large `doc` perf. regression in https://github.com/rust-lang/rust/pull/141605.
