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vm_insnhelper.c: cfp error at stack overflow

• vm_insnhelper.c (threadptr_stack_overflow): set stack overflow
  flag until handling execptions, to get rid of cfp consistency
  error when exec tag was rewound. [ruby-core:80618] [Bug #13412]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59606 b2dd03c8-39d4-4d8f-98ff-823fe69b080e