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

[Sander de Smalen via llvm-commits]

================
@@ -2959,7 +3035,10 @@ MachineBasicBlock *AArch64TargetLowering::EmitInstrWithCustomInserter(
     MI.dump();
 #endif
     llvm_unreachable("Unexpected instruction for custom inserter!");
-
+  case AArch64::InitTPIDR2Obj:
+    return EmitInitTPIDR2Object(MI, BB);
+  case AArch64::ExpandZABuffer:
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sdesmalen-arm wrote:

nit:
```suggestion
  case AArch64::AllocateZABuffer:
```

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