[clang] [clang-format] Support of TableGen identifiers beginning with a number. (PR #78571)

[Hirofumi Nakamura via cfe-commits]

hnakamura5 wrote:

I changed the algorithm of handleTableGenNumericLikeIdentifier.
Stopped to follow the original implementation in llvm::TGLexer::LexToken and clarified the conditions.

https://github.com/llvm/llvm-project/pull/78571