Pointers to add doulle-float capabilities for the avr target

[hutchinsonandy@aim.com]

That looks correct.


Be aware that support for handling  long long operands (64 bits) - or 
doubles is not well supported on AVR.  So you may expose some problems 
with this.

We currently have long long disabled in testsuite testing to avoid 
noise.  At some point I hope to switch it back on to see where we are - 
but I have enough to deal with <64 bits a present.


Andy