[llvm] [TableGen] Added submulticlass typechecking to template arg values. (PR #112904)

[via llvm-commits]

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@@ -37,7 +37,7 @@ defvar VOPDX_Max_Index = 12;
 
 class VOPD_Component<bits<5> OpIn, string vOPDName> {
   Instruction BaseVOP = !cast<Instruction>(NAME);
-  string VOPDName = "v_dual_" # !substr(vOPDName, 2);
+  string VOPDName = "v_dual_" # !if(!le(!size(vOPDName), 2), "", !substr(vOPDName, 2));
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jofrn wrote:

It is in the dynamic nature of TableGen. Typechecking resolves fields when it needs to do so. Adding CheckTemplateArgValues to this location mirrors the location it is at within `ParseSubClassReference`, so fields are also resolved when parsing non-multi sub classes.

https://github.com/llvm/llvm-project/pull/112904