なんで Bump pointer allocation https://github.com/apple/swift-syntax/pull/544

Bump allocated RawSyntax by rintaro · Pull Request #544 · apple/swi...

Introduce SyntaxArena that manages the memory of RawSyntax RawSyntaxData is the "data" of raw syntax managed by SyntaxArena, and it has Unowned pointer to the SyntaxArena Tagged union of...