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1a014d42f4
Because the three kinds of operand are now distinguished explicitly, we no longer need fiddly code to disambiguate counter IDs and expression IDs based on the total number of counters/expressions in a function. This does increase the size of operands from 4 bytes to 8 bytes, but that shouldn't be a big deal since they are mostly stored inside boxed structures, and the current coverage code is not particularly size-optimized anyway.