private Set<String> getKnownCallingConventionSet() {
		if (knownCallingConventions == null) {
			knownCallingConventions = buildKnownCallingConventionSet();
		}
		return knownCallingConventions;
	}
Get (and assign if needed thus requiring open transaction) the ID associated with the 
specified calling convention name.  If name is a new convention and the number of stored
convention names exceeds 127 the returned ID will correspond to the unknown calling 
convention.
@param name calling convention name
@param restrictive if true an error will be thrown if name is not defined by 
{@link GenericCallingConvention} or the associated compiler specification if 
datatype manager has an associated program architecture.
@return calling convention ID
@throws IOException if database IO error occurs
@throws InvalidInputException if restrictive is true and name is not defined by 
{@link GenericCallingConvention} or the associated compiler specification if 
datatype manager has an associated program architecture.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/data/DataTypeManagerDB.java