@Override
	public String toString() {
		return ((guid != null) ? guid.toString() : String.format("%08X", signature)) + ", " + age +
			", " + version + ", " + processor;
	}
Returns the GUID for the PDB.
@return {@link GUID} for the PDB.
Ghidra/Features/PDB/src/main/java/ghidra/app/util/bin/format/pdb2/pdbreader/PdbIdentifiers.java