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This patch restores handwritten linear searches instead of the use of std::find. After PR #109412, a performance regression was observed that's caused by the use of std::find for linear searches. The exact cause wasn't pinpointed, but, at the time of writing, the most likely culprit is the forced loop unrolling in the definition of libstdc++'s std::find. Presumably this is done to optimise for larger containers. However for the case of small containers such as SmallVector, this actually hurts performance.
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