time: Deprecate the library in the distribution
This commit deprecates the entire libtime library in favor of the externally-provided libtime in the rust-lang organization. Users of the `libtime` crate as-is today should add this to their Cargo manifests: [dependencies.time] git = "https://github.com/rust-lang/time" To implement this transition, a new function `Duration::span` was added to the `std::time::Duration` time. This function takes a closure and then returns the duration of time it took that closure to execute. This interface will likely improve with `FnOnce` unboxed closures as moving in and out will be a little easier. Due to the deprecation of the in-tree crate, this is a: [breaking-change] cc #18855, some of the conversions in the `src/test/bench` area may have been a little nicer with that implemented
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