[clang-tools-extra] [clang-tidy]add new check `bugprone-compare-pointer-to-member-virtual-function` (PR #66055)

[Piotr Zegar via cfe-commits]

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@@ -0,0 +1,29 @@
+//===--- ComparePointerToMemberVirtualFunctionCheck.h - clang-tidy *- C++ -*-===//
+//
+// 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_COMPAREPOINTERTOMEMBERVIRTUALFUNCTIONCHECK_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_COMPAREPOINTERTOMEMBERVIRTUALFUNCTIONCHECK_H
+
+#include "../ClangTidyCheck.h"
+
+namespace clang::tidy::bugprone {
+
+/// [expr.eq] If either is a pointer to a virtual member function, the result is unspecified.
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PiotrZSL wrote:

Should be in sync with release notes and documentation: "Detects unspecified behavior about equality comparison between pointer to member virtual function and anything other than null-pointer-constant."

https://github.com/llvm/llvm-project/pull/66055