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

[Benjamin Maxwell via llvm-commits]

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@@ -28,6 +28,17 @@ def AArch64_restore_zt : SDNode<"AArch64ISD::RESTORE_ZT", SDTypeProfile<0, 2,
 def AArch64_save_zt : SDNode<"AArch64ISD::SAVE_ZT", SDTypeProfile<0, 2,
                              [SDTCisInt<0>, SDTCisPtrTy<1>]>,
                              [SDNPHasChain, SDNPSideEffect, SDNPMayStore]>;
+
+def SDT_FORM_STRIDED_TUPLE_X2 : SDTypeProfile<2, 2,
+                             [SDTCisVec<0>, SDTCisSameAs<0, 1>,
+                              SDTCisSameAs<0, 2>, SDTCisSameAs<0, 3>]>;
+
+def SDT_FORM_STRIDED_TUPLE_X4 : SDTypeProfile<4, 4,
+                             [SDTCisVec<0>, SDTCisSameAs<0, 1>,
+                              SDTCisSameAs<0, 2>, SDTCisSameAs<0, 3>,
+                              SDTCisSameAs<0, 4>, SDTCisSameAs<0, 5>,
+                              SDTCisSameAs<0, 6>, SDTCisSameAs<0, 7>]>;
+
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MacDue wrote:

Unused?

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