* compile.c (iseq_set_sequence): use "nop" insn instead of
  "jump to next insn".
  https://bugs.ruby-lang.org/issues/8543#change-50085



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48579 b2dd03c8-39d4-4d8f-98ff-823fe69b080e