Here, we change the EVM stack implementation to use an 'arena', i.e.
a shared allocation pool for sub-call stacks. The stack is now more
GC-friendly, since it is a slice of uint256 values instead of a slice of pointers.
Code that pushes an item to the stack has been changed to get() the top
item, then overwrite it.
The PR is a rewrite/rebase of #30362.
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Co-authored-by: Martin Holst Swende <martin@swende.se>
Co-authored-by: Marius van der Wijden <m.vanderwijden@live.de>
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