ECO command. Stitch scan chain
Usage:stitch_scan_chain(@options); @options: -to $flop_inst: Stitch all new flops into the flop_inst
Note:The command creates a new sub-scan-chain for the all new flops, break the chain connecting the instance, and stitch in the new sub-scan-chain.
Examples:stitch_scan_chain("-to", "abc_reg"); # Insert new flops' scan chain into the existing flop 'abc_reg'