int validateAllOldLanguages() {
		int errorCnt = 0;
		for (OldLanguage oldLang : languageMap.values()) {
			try {
				oldLang.validate();
			}
			catch (Exception e) {
				Msg.error(log, "Failed to validate old language: " + oldLang.getDescription() +
					" (Version " + oldLang.getVersion() + ")", e);
				++errorCnt;
			}
		}
		return errorCnt;
	}
Validate all old language definitions contained within the old language map.  
This is intended to be used by a unit test.
@return number of validation errors
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/util/OldLanguageFactory.java