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[flang][NFC] Change how error symbols are recorded

Authored by tskeith on Aug 27 2020, 2:46 PM.



When an error is associated with a symbol, it was marked with a flag
from Symbol::Flag. The problem with that is that you need a mutable
symbol to do that. Instead, store the set of error symbols in the
SemanticsContext. This allows for some const_casts to be eliminated.

Also, improve the internal error that occurs if SetError is called
but no fatal error has been reported.

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tskeith created this revision.Aug 27 2020, 2:46 PM
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tskeith requested review of this revision.Aug 27 2020, 2:46 PM
PeteSteinfeld accepted this revision.Aug 27 2020, 3:19 PM

All builds, tests, and looks good.

This revision is now accepted and ready to land.Aug 27 2020, 3:19 PM
sscalpone accepted this revision.Aug 27 2020, 4:55 PM
This revision was automatically updated to reflect the committed changes.