public AssemblyPatternBlock fillMask() {
		byte[] newMask = new byte[this.mask.length];
		for (int i = 0; i < newMask.length; i++) {
			newMask[i] = (byte) 0xff;
		}
		return new AssemblyPatternBlock(offset, newMask, vals);
	}
Fill all unknown bits with 0 bits

@return the result
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/app/plugin/assembler/sleigh/sem/AssemblyPatternBlock.java