bug#65491: [PATCH] Improve performance allocating vectors

[Mattias Engdegård]

> The conversion at the other end, TAG_PTR, suffers from the same potential 
> problem but in reverse, which is perhaps less obvious to the casual C 
> programmer but nevertheless a danger of the same kind, so we'd better do 
> something about it as well. I'll be back with a proposed patch.

Here it is. Very straightforward: just flip a cast and remove unused 
definitions.

0001-Don-t-use-pointer-arithmetic-for-pointer-tagging-bug.patch
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