long longValue() throws RuntimeException {
		if (value != null) {
			return value.longValue();
		}
		throw new RuntimeException();
	}
Returns current register value.
@throws RuntimeException if value is unknown or has not been set.
The hasValue should be used to ensure that a value has been set.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/analysis/RegisterContextBuilder.java