[clang] [clang-format][NFC] Introduce isNotOneOf (PR #161021)

[via cfe-commits]

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@@ -1877,8 +1880,9 @@ struct AdditionalKeywords {
     // In Verilog the colon in a default label is optional.
     return Tok.is(TT_CaseLabelColon) ||
            (Tok.is(tok::kw_default) &&
-            !(Next && Next->isOneOf(tok::colon, tok::semi, kw_clocking, kw_iff,
-                                    kw_input, kw_output, kw_sequence)));
+            (!Next ||
+             Next->isNotOneOf(tok::colon, tok::semi, kw_clocking, kw_iff,
+                              kw_input, kw_output, kw_sequence)));
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owenca wrote:

For pointers, I prefer `!(Next && Next->isOneOf(A, B)` to `!Next || Next->isNotOneOf(A, B)` because the `Next &&` part is just for avoiding dereferencing a null pointer.

https://github.com/llvm/llvm-project/pull/161021