Feature: Create linked list for stack and its stack items

[anthdm]

Problem

A VM implementation needs to push and pop a lot of data. Using a stretchy buffer (which the std::list is) will need to grow a lot in a single program execution, an intensive operation.

Solution

A double linked list will significantly improve performance. We could use a single linked list, but some DROP instructions will remove list items that are not on the top of the stack. I suggest using a double linked list implementation.

[shargon]

Acording to this http://en.cppreference.com/w/cpp/container/list std::list It is usually implemented as a doubly-linked list

[anthdm]

@shargon I see. Learning every day :). I assume that will do the trick. You can close this if you want.