Fix crashes in the peephole optimizer on OpenBSD/sparc64 These crashes are due to alignment issues, casting ADJUST to INSN and then accessing after the end of the ADJUST. These patches come from Stefan Sperling <stsp@apache.org>, who reported the issue.
merge revision(s) 0ba27259d390e902139c0e2e94b9d18ef227748e: [Backport #16940]