[clang] [NFC][Clang][Preprocessor] Refine the implementation of isNextPPTokenOneOf (PR #145546)

[via cfe-commits]

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@@ -2304,7 +2304,8 @@ class Preprocessor {
 
   /// Check whether the next pp-token is one of the specificed token kind. this
   /// method should have no observable side-effect on the lexed tokens.
-  template <tok::TokenKind K, tok::TokenKind... Ks> bool isNextPPTokenOneOf() {
+  template <typename... Ts>
+  bool isNextPPTokenOneOf(tok::TokenKind K, Ts... Ks) {
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yronglin wrote:

Yes, I think `bool isNextPPTokenOneOf(Ts... Ks) with static_assert(sizeof...(Ks))` is equal to `bool isNextPPTokenOneOf(tok::TokenKind K, Ts... Ks)`. But static_assert may give a more clear diagnostic. WDYT?

https://github.com/llvm/llvm-project/pull/145546