Commits on Oct 7, 2020

1. Upgrade to tracing 0.2.13 …

   The primary motivation is to get the changes from
   tokio-rs/tracing#990. Example output:
   
   ```
   $ RUSTDOC_LOG=debug rustdoc +rustc2
   warning: some trace filter directives would enable traces that are disabled statically
    | `debug` would enable the DEBUG level for all targets
    = note: the static max level is `info`
    = help: to enable DEBUG logging, remove the `max_level_info` feature
   ```
   
   - Remove useless test
   
     This was testing for an ICE when passing `RUST_LOG=rustc_middle`.  I
     noticed it because it started giving the tracing warning (because tests
     are not run with debug-logging enabled). Since this bug seems unlikely
     to re-occur, I just removed it altogether.

   

   jyn514 committed Oct 7, 2020
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