stack_extend
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@36251 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
stack_extend
space with for restoring machine stack stored in each threads, from
optimization out. backport r34278 from the trunk.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@36251 b2dd03c8-39d4-4d8f-98ff-823fe69b080e