some varargs handling

compiler/nir/nirtypes.nim

@@ -180,6 +180,9 @@ proc addNominalType*(tree: var TypeGraph; kind: NirTypeKind; name: string) =
   assert kind in {ObjectTy, UnionTy}
   tree.nodes.add TypeNode(x: toX(kind, tree.names.getOrIncl(name)))
 
+proc addVarargs*(tree: var TypeGraph) =
+  tree.nodes.add TypeNode(x: toX(VarargsTy, 0'u32))
+
 proc getFloat128Type*(tree: var TypeGraph): TypeId =
   result = TypeId tree.nodes.len
   tree.nodes.add TypeNode(x: toX(FloatTy, 128'u32))

compiler/nir/types2ir.nim

@@ -101,6 +101,8 @@ proc procToIr(c: var Context; t: PType): TypeId =
   # XXX Add Calling convention here!
   for i in 0..<t.len:
     c.g.addType fieldTypes[i]
+  if tfVarargs in t.flags:
+    c.g.addVarargs()
   result = sealType(c.g, obj)
 
 proc nativeInt(c: Context): TypeId =