[llvm] [LLVM] Add `llvm.experimental.vector.compress` intrinsic (PR #92289)

[Lawrence Benson via llvm-commits]

lawben wrote:

@lukel97 I've renamed the intrinsic to `llvm.experimental.vector.compress`.
@efriedma-quic I've taken your wording and added it to the docs. I think it described the semantics clearly, so I don't see any reason to change it. I've also frozen the mask entries.

https://github.com/llvm/llvm-project/pull/92289