[clang-tools-extra] [clang-tidy] Adds readability-redundant-const check (PR #189733)

[Victor Chernyakin via cfe-commits]

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@@ -0,0 +1,156 @@
+// RUN: %check_clang_tidy -std=c++11-or-later %s readability-redundant-const %t --
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localspook wrote:

```suggestion
// RUN: %check_clang_tidy -std=c++11-or-later %s readability-redundant-const %t
```

https://github.com/llvm/llvm-project/pull/189733