public AssemblyPatternBlock shift(int amt) {
		if (amt == 0) {
			return this;
		}
		return new AssemblyPatternBlock(this.offset + amt, mask, vals);
	}
Shift, i.e., increase the offset of, this pattern block

@param amt the amount to shift right
@return the shifted pattern block
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/app/plugin/assembler/sleigh/sem/AssemblyPatternBlock.java