Commits on Mar 15, 2021

1. Don't encode file information for span with a dummy location …

   Fixes rust-lang#83112
   
   The location information for a dummy span isn't real, so don't encode
   it. This brings the incr comp cache code into line with the Span
   `StableHash` impl, which doesn't hash the location information for dummy
   spans.
   
   Previously, we would attempt to load the 'original' file from a dummy
   span - if the file id changed (e.g. due to being moved on disk), we would get an
   ICE, since the Span was still valid due to its hash being unchanged.

   

   Aaron1011 committed Mar 15, 2021
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