[Mondrian] Performance: CellInfoPool

[Julian Hyde]

> Peter Tran wrote:
>
> ObjectPool performs a lot better than HashSet for the String test and
> comparable for the Integer test.
> 
> Am I reading this wrong?

You are correct, Peter. My tests show there is no performance bug with
ObjectPool.

ObjectPool is also superior for this purpose because it uses significantly
less memory.

There still might be a performance bug with CellInfoPool - I didn't test
that.

Julian