merge revision(s) 59181: [Backport ]

    vm_insnhelper.c: break in once

    * vm_insnhelper.c (vm_throw_start): size of catch table has been
      included in iseq_catch_table struct, which could be NULL, since
      2.2.  e.g., proc-closure in `once'.
      [ruby-core:81775] [Bug #13680]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@59491 b2dd03c8-39d4-4d8f-98ff-823fe69b080e