Garbage Collection

[andrew-johnson-4]

It is time.

• ✓ implement malloc / free
• ✓add parser option to mark functions as hooks (λ:Hook. y)
• ✓ plural calling convention for fragments and functions that are marked as hooks
• ✓ rc::new
• ✓ single structs automatically knows its own Tag
• ✓ inc / del Rc (decrement and destroy if count <= zero)
• ✓ fix cdecl calling convention to work without full knowledge of stack state
• ✓ del hooks in unframe
• ✓ del hooks in function return, if, while
• ✓ increment for Rc, pass through inc for all other types
• sorted order for hook application
• when defining constructors, if a field has a destructor, then the whole type needs a destructor too
• Mov, Del, open, close, push, pop for rc.
  • Constructor +1
  • CopyMove +1
  • discard StackVariable -1
  • ✓ variable out of scope -1
  • StackVariables should not hold a reference (data in transit is free)?
• Migrate compiler to reference counting, but don't free yet, and log all would-be crash sites
• Fix all compiler reference bugs, then actually reclaim unused memory