performance: increase perfomance when build with -tag release

[pnsafonov]

Conditional compilation to fix #408

[wader]

I think you can skip option.go and have this in norelease.go

const CheckChildAlreadyExists = true

and this in release.go

const CheckChildAlreadyExists = false

[wader]

But did my patch earlier to use a map fix the performance issue? if so i would probably prefer that to keep things simple, generally try to avoid having options if possible

[pnsafonov]

But did my patch earlier to use a map fix the performance issue? if so i would probably prefer that to keep things simple, generally try to avoid having options if possible

Yes, patch with map fix performance issue. Same performance as conditional compile approach.
Merge request:
#411

[pnsafonov]

Alternative is used:
#411