[libcxx-commits] [libcxx] [libc++][NFC] Refactor `[[nodiscard]]` tests (PR #173451)

[Hristo Hristov via libcxx-commits]

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H-G-Hristov wrote:

This test `system_error` on Windows. We have a subdirectory `tests\libcxx\diagnostics\syserr` with nodiscard tests already. It was moved in there - one directory down. IMO It belongs there.

https://github.com/llvm/llvm-project/pull/173451