public boolean allUnknown(int length) {
		return block.allUnknown(index, length);
	}
If the -length- instructions, starting with this, are all unmatched, return true;
@param length is number of instructions to check
@return true if all checked instructions are unmatched
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/correlate/InstructHash.java