1. A method of facilitating processing in a processing environment, said method comprising: obtaining an instruction to be executed in the processing environment; determining whether the instruction is to be included in a current group of instructions or a new group of instructions, wherein the determining is based on whether the instruction is a candidate for optimization with another instruction according to an optimization criterion, and wherein the determining further comprises: checking whether an instruction sequence to be optimized that includes at least the instruction and the other instruction fits in the current group of instructions, which the checking includes checking a marker associated with the instruction, the marker indicating a length of the instruction sequence; and forming the new group of instructions based on determining the instruction is a candidate for optimization and the instruction sequence does not fit in the current group of instructions, wherein the new group of instructions includes the instruction and the other instruction; and based on forming the new group of instructions, executing at least one instruction associated with the new group of instructions.