[llvm] [GlobalIsel][NFC] Hygiene (PR #109047)

[Thorsten Schütt via llvm-commits]

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@@ -160,23 +160,8 @@ bool CombinerHelper::matchExtractVectorElementWithBuildVector(
   //  %extract:_(32) = COPY %arg1(s32)
   //
   //
-  //
-  //  %bv:_(<2 x s32>) = G_BUILD_VECTOR %arg1(s32), %arg2(s32)
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tschuett wrote:

The index is never `opaque`. It is always a constant due to the pattern.

https://github.com/llvm/llvm-project/pull/109047