[clang-tools-extra] [clang-tidy] Add new `bugprone-suspicious-pointer-arithmetics-using-sizeof` (`cert-arr39-c`) check (PR #106061)

[Nicolas van Kempen via cfe-commits]

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@@ -0,0 +1,108 @@
+//===--- SuspiciousPointerArithmeticsUsingSizeofCheck.cpp - clang-tidy ----===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "SuspiciousPointerArithmeticsUsingSizeofCheck.h"
+#include "../utils/Matchers.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+#include "clang/Lex/Lexer.h"
+
+using namespace clang::ast_matchers;
+
+namespace clang::tidy::bugprone {
+
+namespace {
+
+constexpr llvm::StringLiteral BinOp{"bin-op"};
+constexpr llvm::StringLiteral PointedType{"pointed-type"};
+constexpr llvm::StringLiteral ScaleExpr{"scale-expr"};
+
+const auto IgnoredTypes = qualType(
+    anyOf(asString("char"), asString("unsigned char"), asString("signed char"),
+          asString("int8_t"), asString("uint8_t"), asString("std::byte"),
+          asString("const char"), asString("const unsigned char"),
+          asString("const signed char"), asString("const int8_t"),
+          asString("const uint8_t"), asString("const std::byte")));
+const auto InterestingPointer = pointerType(unless(pointee(IgnoredTypes)));
+
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nicovank wrote:

```suggestion
```

This is unused.

https://github.com/llvm/llvm-project/pull/106061