Rahul Joshi e6751bfbf7 [NFC][TableGen] Elminate use of isalpha/isdigit from TGLexer (#104837) ...

- Replace use of std::isalpha, std::isdigit, std:isxdigit with LLVM's
StringExtras versions, to avoid possibly locale dependent behavior (e.g.
glibc).
- Create helper function for common checks for valid identifier
characters.

2024-08-20 09:54:12 -07:00

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