[libcxx-commits] [libcxx] [libc++][ranges] Add sentinel `OtherConst` cases for `[[nodiscard]]` tests in `enumerate_view` (PR #209289)

[Hristo Hristov via libcxx-commits]

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Zingam wrote:

```suggestion
// expected-warning at +1 {{ignoring return value of function declared with 'nodiscard' attribute}}
it + 1;
// expected-warning at +1 {{ignoring return value of function declared with 'nodiscard' attribute}}
1 + it;
```

https://github.com/llvm/llvm-project/pull/209289