[clang-tools-extra] [clang-tidy] add modernize-use-constexpr check (PR #162741)

[Victor Chernyakin via cfe-commits]

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@@ -0,0 +1,17 @@
+// RUN: %check_clang_tidy -std=c++11 %s modernize-use-constexpr %t -- -- -fno-delayed-template-parsing
+// RUN: %check_clang_tidy -std=c++14 %s modernize-use-constexpr %t -- -- -fno-delayed-template-parsing
+// RUN: %check_clang_tidy -std=c++17 %s modernize-use-constexpr %t -- -- -fno-delayed-template-parsing
+// RUN: %check_clang_tidy -std=c++20 %s modernize-use-constexpr %t -- -- -fno-delayed-template-parsing
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localspook wrote:

```suggestion
// RUN: %check_clang_tidy -std=c++11,c++14,c++17,c++20 %s modernize-use-constexpr %t -- -- -fno-delayed-template-parsing
```

https://github.com/llvm/llvm-project/pull/162741