Shrink `LiveNode`.
`Liveness::users` is a vector that is occasionally enormous. For example, doing a "clean incremental" check build of `inflate`, there is one instance that represents 5,499 live nodes and 1087 vars, which requires 5,977,413 entries. At 24 bytes per entry, that is 143MB. This patch changes LiveNode from a usize to a u32. On 64-bit machines that halves the size of these entries, significantly reducing peak memory usage and memory traffic, and speeding up "clean incremental" builds of `inflate` by about 10%.
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