How can INITIAL_FRAME_POINTER_OFFSET be made correct?

[Joern Rennecke]

>   There's a bit of a problem, however.  regs_ever_live[LINK_REGNUM] is zero
> when INITIAL_FRAME_POINTER_OFFSET is called, but something has set it to one
> by the time we get to the emit prologue function.  The result is that the
> two of them disagree about the size and layout of my stackframes, and I get
> a lot of FAILs in the varargs tests.

Is LINK_RENUM eliminable, or can something else be eliminated to it?