[clang] [Clang] [NFC] Introduce factory functions for `Token` (PR #229254)

[Corentin Jabot via cfe-commits]

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@@ -192,6 +192,34 @@ class Token {
     Loc = SourceLocation().getRawEncoding();
   }
 
+  static Token Create(tok::TokenKind Kind, SourceLocation Loc,
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cor3ntin wrote:

We have a lot more capitalized functions than not, this is consistent with existing style

https://github.com/llvm/llvm-project/pull/229254