public int align4() {
		int excess = (index - alignMarker) & 0x03;
		int pad = (excess == 0) ? 0 : 4 - excess;
		index += pad;
		return pad;
	}
Moves the index of the PdbByteReader to align on a 4-byte boundary of the initializing
 byte array, modified by an alignment modifier passed in by {@link #markAlign(int)}.
@return The number added to the index.
Ghidra/Features/PDB/src/main/java/ghidra/app/util/bin/format/pdb2/pdbreader/PdbByteReader.java