[llvm] [WebAssembly] Add more lowerings for wide-arithmetic (PR #132430)

[Alex Crichton via llvm-commits]

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@@ -1794,10 +1809,32 @@ SDValue WebAssemblyTargetLowering::LowerMUL_LOHI(SDValue Op,
   }
   SDValue LHS = Op.getOperand(0);
   SDValue RHS = Op.getOperand(1);
-  SDValue Hi =
+  SDValue Lo =
       DAG.getNode(Opcode, DL, DAG.getVTList(MVT::i64, MVT::i64), LHS, RHS);
-  SDValue Lo(Hi.getNode(), 1);
-  SDValue Ops[] = {Hi, Lo};
+  SDValue Hi(Lo.getNode(), 1);
+  SDValue Ops[] = {Lo, Hi};
+  return DAG.getMergeValues(Ops, DL);
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alexcrichton wrote:

I'll note that this change is unrelated to this commit but is a drive-by fix for the names here since the Hi/Lo variable names were wrong, despite construction here actually being correct. I swapped them for future clarity.

https://github.com/llvm/llvm-project/pull/132430