Feature Request: Ability to inline VM handlers

[notpidgey]

Describe the solution you'd like
This solution should work with the current implementation of "call_vm_handler".

Currently call_vm_handler is defined like this:

void base_handler_entry::call_vm_handler(function_container& container, code_label* jump_label)

However, this solution would require an overload that is similar to this:

void base_handler_entry::call_vm_handler(function_container& container, inst_handler_entry* handler, ..., bool inline) {...}
void base_handler_entry::call_vm_handler(function_container& container, vm_handler_entry* handler, ..., bool inline) {...}

In these overloads call_vm_handler should resolve the correct handler_info which corresponds to the arguments of call_vm_handler such as width, operand count, and override(currently not implemented).

If inline is true, call_vm_handler will generate the handler definition inside of the call_vm_handler. There are many problems with this such as the fact that vm handlers call other vm handlers. This would require a major refactor to how handlers are generated and built.