[llvm] [AArch64] Align 0-cycle reg-mov model of GPR64, GPR32 reg classes (PR #146051)

[David Green via llvm-commits]

================
@@ -107,6 +107,8 @@ Changes to the AArch64 Backend
   [#132196](https://github.com/llvm/llvm-project/pull/132196),
   [#133084](https://github.com/llvm/llvm-project/pull/133084))
 
+* **Breaking Change:** Change target feature name from `zcm` to `zcm-gpr64`.
----------------
davemgreen wrote:

As they are only tuning features I would not expect any users to use them. (And -mzcm isn't a valid option AFAIU). I would remove the release note, or at least remove the "Breaking Change" part. Maybe it is good to call these kinds of things out.

https://github.com/llvm/llvm-project/pull/146051