[TypeSystem] Figure out method 7 (relocate)

[water111]

All GOAL objects have 9 methods:

• new
• delete
• print
• inspect
• length
• asize
• copy
• relocate
• mem-usage

Strangely, the relocate method comes in two different versions.

The first version is used to move an object in memory, like this:

(relocate proc (- size))

which moves it back size bytes in memory. This takes two arguments (this _type_), and (offset int). This method is defined for object in gkernel, and many others in relocate.gc.

The second version is used by the linker when it finishes linking a v2/v4 object. This takes three arguments: (this _type), (heap kheap), and (name (pointer uint8)) (a C string).

We need an option to "override" a method definition in a type tree. This is an unsafe thing to do in general and relies on the programmer being careful on what they call relocate on - doing it on an object is a dangerous thing to do.