alloc_phi
phi1 = alloc_phi(ep->active, src1, expr->ctype);
phi2 = alloc_phi(ep->active, src2, expr->ctype);
phi1 = alloc_phi(ep->active, src1, expr->ctype);
phi2 = alloc_phi(ep->active, src2, expr->ctype);
pseudo_t phi = alloc_phi(parent, src, ctype);
phi2 = alloc_phi(ep->active, src2, ctype);
phi = alloc_phi(ep->active, src, ctype);
pseudo_t alloc_phi(struct basic_block *source, pseudo_t pseudo, struct symbol *type);
phi = alloc_phi(parent, one->target, one->type);
pseudo_t phi = alloc_phi(par, val, var);