Get TOC base for 'main' from opd table entry.
Get TOC base for 'main' from opd table entry.

alvintpwang/hostboot,Over-enthusiastic/hostboot,csmart/hostboot,open-power/hostboot,alvintpwang/hostboot,alvintpwang/hostboot,Over-enthusiastic/hostboot,csmart/hostboot,alvintpwang/hostboot,Over-enthusiastic/hostboot,csmart/hostboot,csmart/hostboot,alvintpwang/hostboot,open-power/hostboot,open-power/hostboot,Over-enthusiastic/hostboot,csmart/hostboot,open-power/hostboot,open-power/hostboot,Over-enthusiastic/hostboot