[flang] [libcxx] [mlir] [llvm] [libc] [clang] [libc++][memory] P1132R8: out_ptr - a scalable output pointer abstraction (PR #73618)

[Louis Dionne via cfe-commits]

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ldionne wrote:

Nit: these test names are a bit hard to read, I would suggest `out_ptr.general.pass.cp`, `out_ptr_t.convert.pass.cpp`, etc.

https://github.com/llvm/llvm-project/pull/73618