void deserializeHeaderOnly() throws CancelledException, IOException, PdbException {
		PdbByteReader reader = pdb.getReaderForStreamNumber(streamNumber, 0, getHeaderLength());
		deserializeHeader(reader);
	}
Returns the stream number for {@link SymbolRecords} component
@return stream number
Ghidra/Features/PDB/src/main/java/ghidra/app/util/bin/format/pdb2/pdbreader/PdbDebugInfo.java