Add a new function DeleteOnOrig

[crowfrog]

Description: add a new function DeleteOnOrig which can do delete operation on original slice. It will really help improve performance by reducing one memory alloc/dealloc and one whole copy per one call.

Benchmark before change:

Benchmark after change:

These is no benchmark case because no new code introduced almost.

[crowfrog]

@buger @daboyuka @AllenX2018