public int findOpByOffset(long offset) {
		for (int i = 0; i < operations.size(); i++) {
			DWARFExpressionOperation op = getOp(i);
			if (op.getOffset() == offset) {
				return i;
			}
		}
		return -1;
	}
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