[clang-tools-extra] [clang-tidy] Add `modernize-use-if-consteval` check (PR #189743)

[Zeyi Xu via cfe-commits]

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@@ -0,0 +1,306 @@
+// RUN: %check_clang_tidy -std=c++23-or-later %s modernize-use-if-consteval %t
+
+namespace std {
+constexpr bool is_constant_evaluated() noexcept {
+  return __builtin_is_constant_evaluated();
+}
+}
+
+namespace mine {
+constexpr bool is_constant_evaluated() noexcept {
+  return __builtin_is_constant_evaluated();
+}
+}
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zeyi2 wrote:

```suggestion
} // namespace mine
```

https://github.com/llvm/llvm-project/pull/189743