Perform a serializing operation on all store-to-memory instructions that were issued prior
to this instruction. Guarantees that every store instruction that precedes, in program order,
is globally visible before any store instruction which follows the fence in program order.
Perform a serializing operation on all store-to-memory instructions that were issued prior to this instruction. Guarantees that every store instruction that precedes, in program order, is globally visible before any store instruction which follows the fence in program order.