[move][move-vm][rewrite][cleanup 2/n] Use arena allocation across the entire runtime AST#21214

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cgswords wants to merge 4 commits intocgsworsd/vm_rewrite_jit_optfrom cgswords/full_package_arena

+1,236-1,053

Commits on Feb 7, 2025

Replace type info with a datatype descriptor cache in vtables, use pointers for those
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Commits on Feb 8, 2025

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Commits on Feb 10, 2025

Add arenavec, arenabox, and use everywhere
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Commits on Feb 19, 2025

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