public MaskedLong readBytes(int start, int len) {
		return MaskedLong.fromMaskAndValue(readMaskBytes(start, len), readValBytes(start, len));
	}
Decode {@code len} bytes (values and mask) in big-endian format, beginning at {@code start}

@param start the first byte to decode
@param len the number of bytes to decode
@return the decoded masked long
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/app/plugin/assembler/sleigh/sem/AssemblyPatternBlock.java