help: real_convert aborts when targetting new cpu

[Tupshin Harper]

I'm trying to target a processor with uncommon size/boundary settings, e.g.
#define BITS_PER_UNIT		32
#define UNITS_PER_WORD		1
#define PARM_BOUNDARY	        32
#define STACK_BOUNDARY		32
#define FUNCTION_BOUNDARY	32
#define BIGGEST_ALIGNMENT	32
#define EMPTY_FIELD_BOUNDARY	32

this is similar the c4x port.

It builds, but when run, cc1 aborts in real_convert(real.c) as should 
happen when fmt is null. It appears that real_convert is being called 
with mode=VOIDMode, and there is no real_format_for_mode that matches. 
I'm not sure why mode is being set to VOIDMode. Does anybody have any 
suggestions for likely things to check? c4x is the only platform that is 
laid out anything like this, and it does strange and mysterious things i 
don't understand yet.

-Tupshin