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b0edd8752a
Prior to this, Liveness encoded `asm`, `call`, and `aggregate_init` with a single 32-bit integer, allowing up to 35 operands (3 are provided by the regular tomb_bits). However, the Zig language allows function calls with more than 35 arguments, inline assembly with more than 35 inputs, and anonymous tuples with more than 35 elements. The new encoding stores an index to the extra array instead of the bits directly, and then as many extra elements as needed to encode all the operands. The MSB is used as a flag to tell which element is the last one, allowing for 31 bits per element. Prior to this, print_air did not bother correctly printing tombstones for these instructions; now it does. In addition to updating the BigTomb iteration logic in the machine code backends, this commit extracts the common logic into the Liveness namespace.