protected PrimitiveMsType getPrimitiveRecord(int recordNumber) {
		if (recordNumber >= typeIndexMin) {
			return null;
		}
		PrimitiveMsType primitive = primitiveTypesByRecordNumber.get(recordNumber);
		if (primitive == null) {
			primitive = new PrimitiveMsType(pdb, recordNumber);
			primitiveTypesByRecordNumber.put(recordNumber, primitive);
		}
		return primitive;
	}
Retrieves the {@link AbstractMsType} record indicated by the recordNumber
@param recordNumber record number to look up
@return {@link AbstractMsType} pertaining to the record number
Ghidra/Features/PDB/src/main/java/ghidra/app/util/bin/format/pdb2/pdbreader/TypeProgramInterface.java