1. A computer program product for facilitating processing in a processing environment, said computer program product comprising: a computer readable storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a 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; based on determining the instruction is to be included in the new group of instructions, forming the new group of instructions, the new group of instructions including the instruction and the another instruction; and based on forming the new group of instructions, executing at least one instruction associated with the new group of instructions.