[llvm] [RISCV][GISel] Lower G_ABDS and G_ABDU (PR #155888)

[Craig Topper via llvm-commits]

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@@ -4742,6 +4755,16 @@ LegalizerHelper::lower(MachineInstr &MI, unsigned TypeIdx, LLT LowerHintTy) {
     return lowerShlSat(MI);
   case G_ABS:
     return lowerAbsToAddXor(MI);
+  case G_ABDS:
+  case G_ABDU: {
+    bool IsSign = MI.getOpcode() == G_ABS;
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topperc wrote:

`IsSign` -> `IsSigned` to match the convention in the rest of this file.

https://github.com/llvm/llvm-project/pull/155888