Commits on Aug 28, 2021

1. Don't use guess_head_span in predicates_of for foreign span …

   Previously, the result of `predicates_of` for a foreign trait
   would depend on the *current* state of the corresponding source
   file in the foreign crate. This could lead to ICEs during incremental
   compilation, since the on-disk contents of the upstream source file
   could potentially change without the upstream crate being recompiled.
   
   Additionally, this ensure that that the metadata we produce for a crate
   only depends on its *compiled* upstream dependencies (e.g an rlib or
   rmeta file), *not* the current on-disk state of the upstream crate
   source files.

   

   Aaron1011 committed Aug 28, 2021
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