[llvm] [AArch64] Add FeatureFuseAdrpAdd for Ampere1/1A (PR #81293)

[David Green via llvm-commits]

davemgreen wrote:

As with the others, changes like this are ideally accompanied by a test case. Otherwise people might refactor in the future and not realize that things are not as they were.

Hopefully that is as simple as adding an extra run line to llvm/test/CodeGen/AArch64/misched-fusion-addadrp.ll?

https://github.com/llvm/llvm-project/pull/81293