private void updateAugmentationDataEx() throws MemoryAccessException {
		augmentationDataEx = new byte[intAugmentationDataExLength];

		program.getMemory().getBytes(getAugmentationExDataAddress(), augmentationDataEx);
	}
Sets the value this region descriptor maintains to indicate the length of the 
augmentation data.

@param len number of bytes that compose the augmentation data
@return the length of the augmentation data or -1 if it has already been set.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/exceptionhandlers/gcc/structures/ehFrame/FrameDescriptionEntry.java