store block size in when using malloc and nogc

[arnetheduck]

this allows for a correct implementation of realloc, which is needed as
code using it assumes new values will be zeroed out / nil

[Araq]

That means 'dealloc' is not an alias for 'free' anymore... What's the point? What IS the point of useMalloc? Let's deprecate it, it's crap.

[arnetheduck]

oh, I found it useful while developing nlvm, to avoid lots of funny memory management code turning up everywhere.. it's nice for debugging as well, as it works with valgrind and friends. nogc mode in general is an interesting tradeoff - for short-running processes it actually makes a lot of sense assuming memory is cheap and plentiful.

I'd think that if someone wants to free c memory (ie stuff they got from c libraries), they should call c_free? that seems to be the way with the other low-level c imports..

[Araq]

Document it properly then. news.txt and nimc.txt.

[arnetheduck]

done