[mlir]use correct iterator when eraseOp#83444

HerrCai0907 merged 4 commits intollvm:mainllvm/llvm-project:mainfrom

HerrCai0907:77420-title-mlir-canonicalize-causes-the-segmentation-fault-in-eraseunreachableblocksHerrCai0907/llvm-project:77420-title-mlir-canonicalize-causes-the-segmentation-fault-in-eraseunreachableblocksCopy head branch name to clipboard