1. A computer program product for facilitating processing in a computing environment, the 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: determining whether a routine is marked as potentially calling a sibling routine; and generating a call sequence to be used in return from the sibling routine, the call sequence based on whether the routine is marked as potentially calling the sibling routine, wherein the call sequence, based on determining the routine is marked as potentially calling the sibling routine, is to restore context information, using restoration code inserted in a caller of the routine, to be used in return from the sibling routine, the routine being marked as potentially calling the sibling routine based on it being determined, prior to runtime, that the routine includes a function call in which no further processing of results of a called function is performed by the routine, and wherein the call sequence, based on determining the routine is not marked as potentially calling the sibling routine, is an abbreviated call sequence and restoration code to restore context information which would be used in return from the sibling routine is omitted in the caller of the routine.