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

[Craig Topper via cfe-commits]

topperc wrote:

> All these intrinsics exist in LLVM for more than a year now, and are widly used, so should not be considered as experimental.

widly -> widely

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