code: def remove_backtrack_blocks_from_fold(folded_ir_blocks):
      
      new_folded_ir_blocks = []
      for block in folded_ir_blocks:
          if not isinstance(block, Backtrack):
              new_folded_ir_blocks.append(block)
      return new_folded_ir_blocks
docs: Return a list of IR blocks with all Backtrack blocks removed.