[clang-tools-extra] [clang-tidy] Allow type-generic builtins in pro-type-vararg check (PR #178656)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- clang-tools-extra/clang-tidy/cppcoreguidelines/ProTypeVarargCheck.cpp clang-tools-extra/test/clang-tidy/checkers/cppcoreguidelines/pro-type-vararg.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang-tools-extra/clang-tidy/cppcoreguidelines/ProTypeVarargCheck.cpp b/clang-tools-extra/clang-tidy/cppcoreguidelines/ProTypeVarargCheck.cpp
index ac1be20f9..7c4286d41 100644
--- a/clang-tools-extra/clang-tidy/cppcoreguidelines/ProTypeVarargCheck.cpp
+++ b/clang-tools-extra/clang-tidy/cppcoreguidelines/ProTypeVarargCheck.cpp
@@ -183,7 +183,8 @@ void ProTypeVarargCheck::check(const MatchFinder::MatchResult &Result) {
     // implementation detail to accept multiple types, not for C-style varargs.
     if (const auto *FD = Matched->getDirectCallee())
       if (const unsigned BuiltinID = FD->getBuiltinID();
-          BuiltinID && Result.Context->BuiltinInfo.hasCustomTypechecking(BuiltinID))
+          BuiltinID &&
+          Result.Context->BuiltinInfo.hasCustomTypechecking(BuiltinID))
         return;
 
     diag(Matched->getExprLoc(), "do not call c-style vararg functions");

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https://github.com/llvm/llvm-project/pull/178656