Files
sx/tests/expected
agra fcbd7a4235 ffi M4.B dealloc: release strong/copy property ivars + destroyWeak weak
emitObjcDefinedClassDeallocImp now walks the class's #property fields
BEFORE freeing the state struct. For each:

- assign  → no-op (primitives, no ARC traffic).
- strong  → val = load field; objc_release(val).
- copy    → same as strong (the stored value is a +1 retained copy
            produced by the setter's [val copy]; we release it here).
- weak    → objc_destroyWeak(&field) — unregisters the slot from
            libobjc's side-table so the runtime stops tracking it.

Order matters: property releases happen BEFORE freeing the state
struct (which would invalidate the pointers we need to read), which
happens BEFORE [super dealloc] (which eventually frees the Obj-C
instance's own memory). The full sequence is now:

  %state    = object_getIvar(self, __sx_state_ivar)
  // M4.B (this commit):
  for each strong/copy property P:
      val = load struct_gep(state, P.idx); objc_release(val)
  for each weak property P:
      objc_destroyWeak(struct_gep(state, P.idx))
  // M4.0c (already shipped):
  allocator = load struct_gep(state, 0)
  allocator.dealloc(state)
  object_setIvar(self, ivar, null)
  // M1.2 A.6:
  [super dealloc]   // → objc_msgSendSuper2

ffi-objc-arc-02-strong-property now passes: child held by parent's
strong property gets released when parent deallocates, refcount → 0,
child deallocates, both states freed via tracker. Balanced 2/2.

189/189 example tests pass; chess on iOS-sim green. M4 complete.
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