[llvm] [AArch64] Add cost model for @experimental.vector.match (PR #118512)

[Ricardo Jesus via llvm-commits]

rj-jesus wrote:

Many thanks for all your feedback @paulwalker-arm, I've just added the shortcut.

If you have no other suggestions, I'll merge this once the tests finish running.

https://github.com/llvm/llvm-project/pull/118512