[llvm] [RISCV] Remove stale comment from test. NFC (PR #81098)

[Luke Lau via llvm-commits]

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@@ -15812,7 +15812,8 @@ SDValue RISCVTargetLowering::PerformDAGCombine(SDNode *N,
           MGN->getMemOperand(), IndexType, MGN->getExtensionType());
 
     if (Index.getOpcode() == ISD::BUILD_VECTOR &&
-        MGN->getExtensionType() == ISD::NON_EXTLOAD) {
+        MGN->getExtensionType() == ISD::NON_EXTLOAD &&
+        isTypeLegal(VT)) {
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lukel97 wrote:

I think this is accidentally from https://github.com/llvm/llvm-project/issues/81088#issuecomment-1933416755

https://github.com/llvm/llvm-project/pull/81098