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Move from `log` to `tracing` The only visible change is that we now get timestamps in our logs: ``` Jul 24 18:41:01.065 TRACE rustc_mir::transform::const_prop: skipping replace of Rvalue::Use(const () because it is already a const Jul 24 18:41:01.065 TRACE rustc_mir::transform::const_prop: propagated into _2 Jul 24 18:41:01.065 TRACE rustc_mir::transform::const_prop: visit_constant: const () ``` This PR was explicitly designed to be as low-impact as possible. We can now move to using the name `tracing` insteads of `log` on a crate-by-crate basis and use any of the other tracing features where desirable. As far as I can tell this will allow tools to seamlessly keep working (since they are using `rustc_driver::init_log...`). This is the first half of step 1 of the accepted `tracing` MCP (https://github.com/rust-lang/compiler-team/issues/331)