Help with lra

[shmeel gutl <shmeelgutl at shmuelhome dot mine dot nu>]

I am trying to enable lra for a propriety backend. I ran into one 
problem that I can't solve. In lra-constraints.c:split_reg 
lra_create_new_reg can be called with a hard code rclass of NO_REGS. It 
then queues a move instruction of the type

 set TYPE:new_reg  TYPE:old_reg

But the NO_REGS rclass stops new_reg from matching a register constraint 
and forces a reload. But the reload will have the same problem. This 
recurses until the recursion limit is hit.

What is my backend missing that will allow a register assignment to new_reg?

Thanks

Shmeel