public int getOuterClassInfoIndex() {
		return outerClassInfoIndex & 0xffff;
	}
If C is not a member of a class or an interface (that is, if C is a top-level
class or interface (JLS ?7.6) or a local class or an anonymous
class, the value of the outer_class_info_index item must
be zero.
<p>
Otherwise, the value of the outer_class_info_index item must be a
valid index into the constant_pool table, and the entry at that index must
be a CONSTANT_Class_info structure representing the class or
interface of which C is a member.
@return a valid index into the constant_pool table, or zero
Ghidra/Processors/JVM/src/main/java/ghidra/javaclass/format/attributes/InnerClass.java