func (t *Type) SetNotInHeap(b bool)  { t.flags.set(typeNotInHeap, b) }
func (t *Type) SetNoalg(b bool)      { t.flags.set(typeNoalg, b) }
func (t *Type) SetDeferwidth(b bool) { t.flags.set(typeDeferwidth, b) }
func (t *Type) SetRecur(b bool)      { t.flags.set(typeRecur, b) }

// Should always do SetHasShape(true) when doing SetIsShape(true).
func (t *Type) SetIsShape(b bool)  { t.flags.set(typeIsShape, b) }