* the whole phi-node with a memory phi. Normally only the value of a phi will
* be spilled unless you mark the phi with be_spill_phi.
* (Remember that each phi needs a register, so you have to spill phis when
* the whole phi-node with a memory phi. Normally only the value of a phi will
* be spilled unless you mark the phi with be_spill_phi.
* (Remember that each phi needs a register, so you have to spill phis when