public int getRelativeOpCodeOffset(int baseOpCode) {
		return opcode - baseOpCode;
	}
Calculates the relative opcode number of this opcode, as compared to a base opcode.
<p>
Ie. If this opcode was DW_OP_reg12 (0x5c), and the base op code was DW_OP_reg0 (0x50),
the result value would be 12.

@param baseOpCode Ordinal value of the opcode that this opcode is being compared ot.
@return numeric difference between this opcode and the base opcode.
Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/format/dwarf/expression/DWARFExpressionOperation.java