[llvm] [AArch64][SME2] Add ZT0 attributes to SMEAttrs (PR #77607)

[Kerry McLaughlin via llvm-commits]

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@@ -58,6 +78,39 @@ TEST(SMEAttributes, Constructors) {
   EXPECT_DEBUG_DEATH(SA(SA::ZA_New | SA::ZA_Preserved),
                      "ZA_New and ZA_Preserved are mutually exclusive");
 
+  EXPECT_DEBUG_DEATH(SA(SA::ZT0_New | SA::ZT0_In),
+                     "ZT0_New, ZT0_In, ZT0_Out, ZT0_InOut and ZT0_Preserved "
+                     "are all \" \"mutually exclusive");
+  EXPECT_DEBUG_DEATH(SA(SA::ZT0_New | SA::ZT0_Out),
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kmclaughlin-arm wrote:

I've added some checks in the Verifier pass, for now these only check that incompatible attributes are not added to the same function.

https://github.com/llvm/llvm-project/pull/77607