DMD internal: appendToModuleMember performance

[Johan Engelen via Digitalmars-d]

On Friday, 15 April 2016 at 19:32:46 UTC, David Nadlinger wrote:
> 
> Another "quick fix" if we have to keep the order would be to 
> add a Bloom filter/… on the side to eliminate most array 
> searches.

In rare cases, symbols are removed from the members list, so the 
shadow data structure needs the ability to delete elements.