int idOfVal(JitVal v) {
		return v instanceof JitVar vv ? vv.id() : -2;
	}
Get the sort key of a given value. Variables get their ID, constants get -2.

@param v the value
@return the sort key
Ghidra/Framework/Emulation/src/main/java/ghidra/pcode/emu/jit/analysis/JitDataFlowModel.java