[llvm] [RISCV] AddEdge between first mask producer and user of V0 (PR #146855)

[Pengcheng Wang via llvm-commits]

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@@ -68,11 +68,33 @@ class RISCVVectorMaskDAGMutation : public ScheduleDAGMutation {
 
   void apply(ScheduleDAGInstrs *DAG) override {
     SUnit *NearestUseV0SU = nullptr;
+    SmallVector<SUnit *, 8> DefMask;
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wangpc-pp wrote:

The size of this vector won't exceed 2? So I think we can reduce 8 to 2.

https://github.com/llvm/llvm-project/pull/146855