[llvm] [AArch64][SME] Remove unused ZA lazy-save (PR #81648)

[Sander de Smalen via llvm-commits]

================
@@ -31,6 +31,22 @@ def AArch64_save_zt : SDNode<"AArch64ISD::SAVE_ZT", SDTypeProfile<0, 2,
 def AArch64CoalescerBarrier
     : SDNode<"AArch64ISD::COALESCER_BARRIER", SDTypeProfile<1, 1, []>, [SDNPOptInGlue, SDNPOutGlue]>;
 
+
+def AArch64ExpandZABuffer : SDNode<"AArch64ISD::ALLOCATE_ZA_BUFFER", SDTypeProfile<1, 1,
----------------
sdesmalen-arm wrote:

nit:
```suggestion
def AArch64AllocateZABuffer : SDNode<"AArch64ISD::ALLOCATE_ZA_BUFFER", SDTypeProfile<1, 1,
```

https://github.com/llvm/llvm-project/pull/81648