Avoid assertion failure when serialising constant integer values. #136
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We used a loop to get the individual bytes of a constant value and serialise them.
This would crash if we ask for 8-bits from the value, but there are fewer than 8 bits to fetch. E.g. for a i1, you can never fetch a whole byte's worth of bits.
This change ensures we fetch the right number of bits (i.e. fewer than 8 if there are fewer than 8 left).
Test for this in ykjit/yk#1107