@Override
	public String toString() {
		return toString(-1, false, false);
	}
Finds the index of an {@link DWARFExpressionOperation operation} by its offset
from the beginning of the expression.

@param offset
@return -1 if there is no op at the specified offset
Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/format/dwarf/expression/DWARFExpression.java