[llvm] [TLI] Make VecDesc statically initializable (PR #211307)

[Valery Chernov via llvm-commits]

vvchernov wrote:

> Yes, that's what I meant -- this code is needed for now to address the stack size bug, but can be changed back once we're allowed to use C++20 or higher for LLVM itself because we'll have constexpr std::optional then.

Oh, I see. @huntergr-arm thank you! I've missed this moment. I've updated the comment in the code to change it back then


https://github.com/llvm/llvm-project/pull/211307