[Issue 21560] md5 poor performance out of the box

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21560

--- Comment #4 from Witold Baryluk <witold.baryluk+d at gmail.com> ---
FYI. Using File(filename).byChunk(32*1024)), to allocate buffer once on a heap,
instead on a stack (which could be unaligned and use big stack offsets, leading
to a bit more poor instruction encodings), leads to the same performance
results.

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