Joel E. Denny a78e13745d [FileCheck] Make invalid prefix diagnostics more precise ...

This will prove especially helpful after D79276, which introduces
comment prefixes.  Specifically, identifying whether there's a
uniqueness violation will be helpful as prefixes will be required to
be unique across both check prefixes and comment prefixes.

Also, remove a related comment about `cl::list` that no longer seems
relevant now that FileCheck is also a library.

Reviewed By: jhenderson, thopre

Differential Revision: https://reviews.llvm.org/D79375

2020-05-11 14:53:48 -04:00

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