[clang] [Clang][SME2] Add multi-vector add/sub builtins (PR #69725)

[Sander de Smalen via cfe-commits]

================
@@ -263,3 +263,38 @@ multiclass ZAFPOuterProd<string n_suffix> {
 
 defm SVMOPA : ZAFPOuterProd<"mopa">;
 defm SVMOPS : ZAFPOuterProd<"mops">;
+
+////////////////////////////////////////////////////////////////////////////////
+// SME2 - ADD, SUB
+
+multiclass ZAAddSub<string n_suffix> {
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sdesmalen-arm wrote:

nit:  
```suggestion
multiclass AddSubZA<string n_suffix> {
```

https://github.com/llvm/llvm-project/pull/69725