Auto merge of #102596 - scottmcm:option-bool-calloc, r=Mark-Simulacrum

Do the `calloc` optimization for `Option<bool>`

Inspired by <https://old.reddit.com/r/rust/comments/xtiqj8/why_is_this_functional_version_faster_than_my_for/iqqy37b/>.
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bors 2022-10-10 18:42:40 +00:00
commit eb1e5d7093

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