[llvm] Reapply "[ARM][NFC] Use addLiveIns method instead of manually adding live ins (#87560)" (PR #96448)

[via llvm-commits]

AtariDreams wrote:

> I'm not familiar with this code, but given the test diffs, this is clearly not NFC, right?

Same thing except sub registers are filtered out. 

https://github.com/llvm/llvm-project/pull/96448