[backend-IRC]进一步构建寄存器分配逻辑

src/backend/RISCv64/RISCv64RegAlloc.cpp

@@ -1108,7 +1108,7 @@ void RISCv64RegAlloc::combine(unsigned u, unsigned v) {
         moveList[u] = moveList.at(v);
     }
     enableMoves({v});
-    for (unsigned t : adjacent(v)) {
+    for (unsigned t : adjList.at(v)) { 
         addEdge(t, u);
         decrementDegree(t);
     }