GC.calloc with random bits causes slowdown, also seen in built in AA

[Michael Rynn]

> a major overhaul, and I introduced a nasty bug that causes this.  Please
> apply the fix identified here:
> http://www.digitalmars.com/webnews/newsgroups.php?
art_group=digitalmars.D.announce&article_id=17841
> 
> Sorry again.  I hope this can be fixed soon.
> 
> -Steve

This particular progressive slowdown of built-in AA is not due to the bug 
introduced with 2-040.  It was present in 2-039, and is also observable 
in the dmd, druntime (rev 265 for lifetime.d), phobos, built from latest 
SVN for the fixed 2-041

The pydict performance still 25% worse than fastest builtin AA, but does 
not slow anything down.  Once the builtin AA tests have been run, 
everything slows down, including the pydict.


Michael

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