[llvm] [AArch64][SME2] Add FORM_STRIDED_TUPLE pseudo nodes (PR #116399)

[Benjamin Maxwell via llvm-commits]

================
@@ -478,6 +478,9 @@ enum NodeType : unsigned {
   SME_ZA_LDR,
   SME_ZA_STR,
 
+  FORM_STRIDED_TUPLE_X2,
+  FORM_STRIDED_TUPLE_X4,
+
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MacDue wrote:

Unused? 

https://github.com/llvm/llvm-project/pull/116399