[llvm] [ARM] Fix inline asm register validation for vector types (PR #152175)

[Eli Friedman via llvm-commits]

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@@ -23,3 +24,8 @@ entry:
   ret void
 }
 
+define void @_Z1dv() local_unnamed_addr {
+entry:
+  tail call void asm sideeffect "", "{d3}"(<16 x i8> undef)
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efriedma-quic wrote:

Don't use undef.

https://github.com/llvm/llvm-project/pull/152175