Revert "[llvm][CodeGen] Address the issue of multiple resource reservations in window scheduling (#100301)" (#101658)

This reverts commit aa0a33b.

Author: kaiyan96

llvm/lib/CodeGen/WindowScheduler.cpp

@@ -451,6 +451,7 @@ int WindowScheduler::calculateMaxCycle(ScheduleDAGInstrs &DAG,
       }
       RM.reserveResources(*SU, CurCycle);
     }
+    RM.reserveResources(*SU, CurCycle);
     OriToCycle[getOriMI(&MI)] = CurCycle;
     LLVM_DEBUG(dbgs() << "\tCycle " << CurCycle << " [S."
                       << getOriStage(getOriMI(&MI), Offset) << "]: " << MI);