[RFC] EPILOGUE_USES on PPC

[Richard Henderson]

> backtrace.c:7: Can't find a register in class `LINK_REGS' while reloading 
> `asm'.

Reload knows that lr is in use.

> +#define	EPILOGUE_USES(REGNO)	((REGNO) == LINK_REGISTER_REGNUM)

Add `reload_completed &&'


r~