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fix: avoid alloacting huge objects on stack

Christoph Hasse requested to merge chasse_smaller_stack into master

This MR makes a few small changed to avoid allocating huge objects on the stack to reduce total stack size.

Motivation was the use of perf to profile HLT2.
perf record --call-graph dward,<stack-size> only lets you specify a max stack-size of 64kB. If the stack is larger than that, perf won't be able to properly unroll the call-chain 😢

But on top this also seems to be better for performance, so it's a win-win 💵 💵 🎉

Edited by Christoph Hasse

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