[clang-tools-extra] Add clang tidy check performance constexpr non static in scope (PR #147809)

[Victor Chernyakin via cfe-commits]

================
@@ -0,0 +1,37 @@
+//===--- ConstexprNonStaticInScopeCheck.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_PERFORMANCE_CONSTEXPRNONSTATICINSCOPECHECK_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_PERFORMANCE_CONSTEXPRNONSTATICINSCOPECHECK_H
+
+#include "../ClangTidyCheck.h"
+
+namespace clang::tidy::performance {
+
+/// FIXME: Write a short description.
+///
+/// For the user-facing documentation see:
+/// http://clang.llvm.org/extra/clang-tidy/checks/performance/constexpr-non-static-in-scope.html
+class ConstexprNonStaticInScopeCheck : public ClangTidyCheck {
+public:
+  ConstexprNonStaticInScopeCheck(StringRef Name, ClangTidyContext *Context)
+      : ClangTidyCheck(Name, Context),
+        WarnInConstexprFuncCpp23(Options.get("WarnInConstexprFuncCpp23", /*Default=*/true)) {}
+  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;
----------------
localspook wrote:

```suggestion
    return LangOpts.CPlusPlus11;
```
`constexpr` is only since C++11

https://github.com/llvm/llvm-project/pull/147809