bors
907c0febe7
Auto merge of #6573 - ehuss:mtime-on-use-feature, r=dwijnand
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Put mtime-on-use behind a feature flag.
This places #6477 behind the `-Z mtime-on-use` feature flag.
The change to update the mtime each time a crate is used has caused a performance regression on the rust playground (rust-lang/rust#57774 ). It is using about 241 pre-built crates in a Docker container. Due to the copy-on-write nature of Docker, it can take a significant amount of time to update the timestamps (over 10 seconds on slower systems).
cc @Mark-Simulacrum
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