[llvm] AArch64: Enable terminal rule (PR #165959)

[Sushant Gokhale via llvm-commits]

sushgokh wrote:

Hi @arsenm 
Apology for late reporting. This commit is causing around 5% regression in `llvm_test_suite / MultiSource/Applications/aha/aha.test` on Neoverse-V2. I am not able to see why this is causing is regression as this commit is causing one more zero latency `mov` and increased no. of `nop`'s. I can provide you annotated perf profile if you need. Let me know.

https://github.com/llvm/llvm-project/pull/165959