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

[Sander de Smalen via llvm-commits]

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@@ -7051,10 +7115,14 @@ SDValue AArch64TargetLowering::LowerFormalArguments(
   if (Subtarget->hasCustomCallingConv())
     Subtarget->getRegisterInfo()->UpdateCustomCalleeSavedRegs(MF);
 
-  // Conservatively assume the function requires the lazy-save mechanism.
+  // Create a 16 Byte TPIDR2 object. The dynamic buffer
+  // will be expanded and stored in the static object later using a pseudonode.
   if (SMEAttrs(MF.getFunction()).hasZAState()) {
-    unsigned TPIDR2Obj = allocateLazySaveBuffer(Chain, DL, DAG);
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sdesmalen-arm wrote:

Can `allocateLazySaveBuffer` be removed now?

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