Introduce ESizeof to InputAST#743
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This allows F* extraction to generate sizeof expressions instead of having to compute sizes internally (impossible for structs due to padding etc). I got help from Claude for the translation into CFlat, I think it looks right but worth a look. This does not add tests, unsure what's a nice way to do that since writing a test in F* implies formalizing sizeof to some extent, which we could do but not sure that's a prerequisite. Kuiper is using this already and working well for the C backend at least.
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This allows F* extraction to generate sizeof expressions instead of having to compute sizes internally (impossible for structs due to padding etc).
I got help from Claude for the translation into CFlat, I think it looks right but worth a look.
This does not add tests, unsure what's a nice way to do that since writing a test in F* implies formalizing sizeof to some extent, which we could do but not sure that's a prerequisite. Kuiper is using this already and working well for the C backend at least.