stg_ap_v_ret porting crash: solved?

[Simon Marlow]

> # I ^C it after a little while:
> 
>     Program received signal SIGINT, Interrupt.
>     0x1212c62b0 in StgRun () at StgCRun.c:6
>     6        * STG-to-C glue.
> 
> 
> So it stalls or loops (it sits at 98% of cpu) on entry to stg_init().
> 
> More info will have to wait until I try a debug build.

Try with a debugging RTS, and use 'stepi' rather than 'step' when in
Haskell code (everything from StgRun onwards), because the debugger
won't have any line number info.

Cheers,
	Simon