[tree-ssa]: Reduce size of phi nodes by 31 bits

[Devang Patel]

On Dec 30, 2003, at 2:27 PM, Richard Henderson wrote:

> On Mon, Dec 29, 2003 at 07:12:01PM -0500, Daniel Berlin wrote:
>> -  int rewritten;
>> +  unsigned int rewritten:1;
>>
>>    struct phi_arg_d GTY ((length ("((tree)&%h)->phi.capacity"))) a[1];
>
> You will note that this doesn't reduce the size of anything.
> Just exchanges data for padding.

Do you think we can steal couple of bits from num_args ?

--
Devang