Combine automatically generated boolean variables

[n1kPLV]

The Netlist-based Compilation will generate excessive amounts of boolean variables with names like _g119 or _cg105. In generated Java code, each of these variables is declared a public boolean. While the amount of memory occupied by a public boolean variable is jvm specific, I doubt that many implementations will actually use less than one byte per boolean. As there are platforms with strict limits on the number of permitted fields (like the NXJ/leJOS platform) it might be sensible to try to combine these booleans for example into one java.util.BitSet.

Some of these generated fields may actually be redundant. (As in: are set to the same value a few codelines apart in which the value is not mutated and the values are not mutated at all.) These fields could probably be removed entirely without changing the program execution.