mem_attrs_htab

[Jakub Jelinek]

On Mon, Aug 22, 2011 at 10:58:48AM +0300, Dimitrios Apostolou wrote:
> the future. I didn't like hashing addresses either, and I was
> surprised I saw no regressions.

Hashing on the expr address as well just results in smaller sharing
in the hash table (i.e. if the expr has different address, but is considered
equal).  The hashing of mem attrs is done just to reduce memory overhead.

	Jakub