Byte size fixes/simplifications in IR serialiser. #199
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We were doing `byte_size = bit_size / 8` which is only true if your bit sizes are all multiples of 8. Found when adding more passes to the AOT pipeline. A bit-size of 1 was being divided by 8 to get 0 and this upset LLVM (assertion failures at AOT compile time).
No functional change.
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See commits.
In general we should be vigilant every time we feel the urge to write expressions like
bit_size / 8.