public int getOpensIndex() {
			return opens_index & 0xffff;
		}
{@code opens_index} must be a valid index into the constant pool. The entry at this
index must be a {@link ConstantPoolPackageInfo} structure representing a package
opened by the current module.
@return {@code opens_index}
Ghidra/Processors/JVM/src/main/java/ghidra/javaclass/format/attributes/ModuleAttribute.java