[clang] [Clang] Add [[clang::no_specializations]] (PR #101469)

[Erich Keane via cfe-commits]

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@@ -473,6 +473,7 @@ def ExpansionToDefined : DiagGroup<"expansion-to-defined">;
 def FlagEnum : DiagGroup<"flag-enum">;
 def IncrementBool : DiagGroup<"increment-bool", [DeprecatedIncrementBool]>;
 def InfiniteRecursion : DiagGroup<"infinite-recursion">;
+def InvalidSpecialization : DiagGroup<"invalid-specialization">;
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erichkeane wrote:

Only 1 warning here, no reason to make a non-inline group.

https://github.com/llvm/llvm-project/pull/101469