[type] Decouple quant from SNode 4/n: Add exponent info to BitStructType #5407
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Related issue = #4857
Previously,
BitStructType
only contained member types and member offsets, which were not enough to handleQuantFloatType
, making quant codegen rely on SNode info. This PR adds exponent info toBitStructType
so that it becomes possible to handleQuantFloatType
(with or without shared exponent) without SNode info.