[libcxx-commits] [libcxx] [libc++] Eliminate extra allocations from `std::move(oss).str()` (PR #67294)

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philnik777 wrote:

IIRC the changes here are not to make us conforming, so all the tests should be either under `libcxx/test/libcxx` or guarded with `#ifdef _LIBCPP_VERSION`.

https://github.com/llvm/llvm-project/pull/67294