[PATCH] D64589: [UpdateTestChecks] Emit warning when invalid value for -check-prefix option

[Dávid Bolvanský via Phabricator via llvm-commits]

xbolva00 added a comment.

@lebedev.ri  @RKSimon

FileCheck says 
"Prefixes must be unique, *start with a letter* and contain only alphanumeric characters, hyphens and underscores"

but it does not enforce it in RE, should we enforce it here?


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  https://reviews.llvm.org/D64589/new/

https://reviews.llvm.org/D64589