[llvm-branch-commits] [clang] [Clang] [C++26] Expansion Statements (Part 7: Constexpr support and tests) (PR #169686)

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Sirraide wrote:

> > Can you clarify the status of the following Core issues in your implementation:
> > [CWG3044](https://cplusplus.github.io/CWG/issues/3044.html) "Iterating expansion statements woes"
> > [CWG3048](https://cplusplus.github.io/CWG/issues/3048.html) "Empty destructuring expansion statements"
> > [CWG3061](https://cplusplus.github.io/CWG/issues/3061.html) "Trailing comma in an expansion-init-list"
> > [CWG3123](https://cplusplus.github.io/CWG/issues/3123.html) "Global lookup for begin and end for expansion statements"
> > [CWG3131](https://cplusplus.github.io/CWG/issues/3131.html) "Value categories and types for the range in iterable expansion statements"
> 
> And [CWG3045](https://cplusplus.github.io/CWG/issues/3045.html) "Regularizing environment interactions of expansion statement"

See https://github.com/llvm/llvm-project/pull/169680#issue-3668377683

https://github.com/llvm/llvm-project/pull/169686