merge revision(s) 49036: [Backport #10660]

	* vm_core.h (rb_vm_living_threads_insert): preserve order
	  [Bug #10660] [ruby-core:67154] [ruby-core:67159]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@49077 b2dd03c8-39d4-4d8f-98ff-823fe69b080e