[llvm] ARM: Move ABI enum from TargetMachine to TargetParser (PR #144725)

[David Green via llvm-commits]

https://github.com/davemgreen commented:

The patch summary is empty and gives no context as to why this is beneficial (either now or in the future when we are looking back at why things changed). Can you update the description to explain the reason a little? Thanks

https://github.com/llvm/llvm-project/pull/144725