Develop dealloc, realloc in XCSL

[CodyFagley]

NOTE: These functions are the easy ones to build.

_xcs_dealloc() and _xcs_realloc() should error check the given values as arguments.

They add commands to the compiled assembly file which store expected arguments in corresponding OS parameter registers. (e.g. x1 - x4)

Afterwards, they call assembly functions like so:

bl  __xcs_alloc   ; Allocate
bl  __xcs_dealloc ; Deallocate
bl  __xcs_realloc ; Reallocate

[CodyFagley]

Added Duplicate label, because this has been a persistent issue for 1.5 years now.
Issues for Memory Allocation are piling up and need to be addressed soon for the language development to proceed.