[llvm-bugs] [Bug 171273] P3663R3: Future-proof `submdspan_mapping`

[LLVM Bugs via llvm-bugs]

Issue	171273
Summary	P3663R3: Future-proof `submdspan_mapping`
Labels	libc++, c++26, wg21 paper
Assignees
Reporter	frederick-vs-ja

    **Link:** https://wg21.link/P3663R3

Feature-test macros (increased):
```c++
#define __cpp_lib_submdspan 202511L // freestanding, also in <mdspan>
```

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