public long getUniqueBase() {
		return unique_base;
	}
This routine gets the base offset, within the unique
temporary register space, where new registers can be
allocated for the simplification process.  Locations before
this offset are reserved registers needed by the pcode
translation engine.
@return the first allocatable offset
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/pcodeCPort/translate/Translate.java