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

[Richard Henderson]

On Tue, Dec 30, 2003 at 02:54:05PM -0800, Devang Patel wrote:
> Do you think we can steal couple of bits from num_args ?

I expect.  Though if you start stealing too many bits, we'll
need to add code to verify that we don't overflow.

It'd be interesting to see what the maximum arity of a phi is
with various exceedingly large switches or computed gotos.


r~