[clang-tools-extra] [clang-tidy] Detect std::rot[lr] pattern within modernize.use-std-bit (PR #186324)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- clang-tools-extra/clang-tidy/modernize/UseStdBitCheck.cpp clang-tools-extra/test/clang-tidy/checkers/modernize/use-std-bit.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/modernize/UseStdBitCheck.cpp b/clang-tools-extra/clang-tidy/modernize/UseStdBitCheck.cpp
index e477bbdf4..d58ec6bd1 100644
--- a/clang-tools-extra/clang-tidy/modernize/UseStdBitCheck.cpp
+++ b/clang-tools-extra/clang-tidy/modernize/UseStdBitCheck.cpp
@@ -196,9 +196,9 @@ void UseStdBitCheck::check(const MatchFinder::MatchResult &Result) {
                   Source.getFileID(MatchedExpr->getBeginLoc()), "<bit>");
     }
 
-    } else {
-      llvm_unreachable("unexpected match");
-    }
+  } else {
+    llvm_unreachable("unexpected match");
   }
+}
 
 } // namespace clang::tidy::modernize

``````````

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https://github.com/llvm/llvm-project/pull/186324