[COMMITTED] tilegx: enable wordsize-64 support for ieee745 dbl-64.

[Chris Metcalf]

On 12/23/2014 5:39 PM, H.J. Lu wrote:
> You can provide a safe default and let x32 override it. 

I think it's conventional now to require that platforms are explicit
about #defines, and use #if with -Wundef.  It seems to make good sense
in this case, since it's really not clear what the right default for
any given platform is.

And since there are currently just two platforms that use wordsize-64
and are !_LP64 (x32 and tilegx32), it feels pretty reasonable to be
explicit for both.  The AArch64 guys will need to set the right default
for their ILP32 mode; I'm not even sure what the right answer is for them.

-- 
Chris Metcalf, EZChip Semiconductor
http://www.ezchip.com