Constructors are now auto-slotted into the vtable by the semantic pass.
When a constructor is called through a metaclass-typed variable
(C.Create(args)), the compiler emits _ClassCreate for allocation
followed by a vtable-indirect call to the most-derived constructor
body. Direct calls (TFoo.Create) remain fully static.
Both backends (QBE and native x86-64) emit correct dispatch for:
- MetaclassVar.Create(args) syntax
- ClassCreate(MetaclassVar, args) builtin
- Zero-arg and multi-arg constructor signatures
This is a layout-changing commit (adds constructor vtable slots).
Verified: FIXPOINT_OK, NATIVE_FIXPOINT_OK, NATIVE_INTERNAL_OK,
3370 tests pass.
215082afc3