[Issue 18441] Add comments to GC page about tradeoffs in design and impl of GC (garbage collector)

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18441

--- Comment #2 from anonymous4 <dfj1esp02 at sneakemail.com> ---
https://blog.plan99.net/modern-garbage-collection-911ef4f8bd8e GC
questionnaire, may be interesting to fill.

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