[clang-tools-extra] Add bugprone-loop-variable-copied-then-modified clang-tidy check. (PR #157213)

[Nicolas van Kempen via cfe-commits]

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@@ -0,0 +1,38 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_LOOPVARIABLECOPIEDTHENMODIFIEDCHECK_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_LOOPVARIABLECOPIEDTHENMODIFIEDCHECK_H
+
+#include "../ClangTidyCheck.h"
+
+namespace clang::tidy::bugprone {
+
+/// Finds loop variables that are copied and subsequently modified.
+///
+/// For the user-facing documentation see:
+/// http://clang.llvm.org/extra/clang-tidy/checks/bugprone/loop-variable-copied-then-modified.html
+class LoopVariableCopiedThenModifiedCheck : public ClangTidyCheck {
+public:
+  LoopVariableCopiedThenModifiedCheck(StringRef Name,
+                                      ClangTidyContext *Context);
+  void storeOptions(ClangTidyOptions::OptionMap &Opts) override;
+  void registerMatchers(ast_matchers::MatchFinder *Finder) override;
+  void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
+  bool isLanguageVersionSupported(const LangOptions &LangOpts) const override {
+    return LangOpts.CPlusPlus;
+  }
+  bool copiedLoopVarIsMutated(const VarDecl &LoopVar,
+                              const CXXForRangeStmt &ForRange,
+                              ASTContext &Context);
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nicovank wrote:

Seems left over from previous code.
```suggestion
```

https://github.com/llvm/llvm-project/pull/157213