[clang] [llvm] [mlir] Move several vector intrinsics out of experimental namespace (PR #88748)

[Maciej Gabka via llvm-commits]

mgabka wrote:

I needed to adjust one more test after another rebase:
llvm/test/Transforms/LoopVectorize/AArch64/reduction-recurrence-costs-sve.ll 

I am merging it know without waiting for the pre commit validation, otrherwise will most likely need to update another tests etc. 

https://github.com/llvm/llvm-project/pull/88748