[clang] [clang] Constexpr for __builtin_shufflevector and __builtin_convertvector (PR #76615)

[Nikolas Klauser via cfe-commits]

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philnik777 wrote:

I just wanted to say thanks for working on this. I'd love to enable the vectorization branches in libc++ during constant evaluation. It's always a great way to have confidence in the correctness of the code, and this brings us a step closer to having fewer `__libcpp_is_constant_evaluated()` in the code base.

https://github.com/llvm/llvm-project/pull/76615