[llvm] [TableGen] Fix concatenation of subreg and artificial subregs (PR #114391)

[Jay Foad via llvm-commits]

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@@ -411,6 +410,9 @@ CodeGenRegister::computeSubRegs(CodeGenRegBank &RegBank) {
         Parts.push_back(getSubRegIndex(SR->ExplicitSubRegs[j]));
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jayfoad wrote:

Nit: could break out early if I.Artificial.

https://github.com/llvm/llvm-project/pull/114391