[rfc] Add some more floatformat types ....

[Andrew Cagney]

>  ia64_ext	- 80-bit double-extended
>     ia64_reg	- 82-bit fp register
>     ia64_quad	- 128-bit quad-precision
> 
> 

I'm not so sure.  I think the first is identical to i387_ext so is 
redundant.  floatformat appears to have adopted the convention of using 
ARCH_ext to specify the format of ARCH's FP-register when spilling to 
memory.
	Andrew

(dig dig, outch! IA64 defines big-endian i387_ext! Lets just ignore that 
one for now :-)