nobu 340390093b eval_intern.h: refine stack overflow detection
* eval_intern.h (TH_PUSH_TAG, TH_EXEC_TAG): refine stack overflow
  detection.  chain local tag after setjmp() successed on it, because
  calling setjmp() also can overflow the stack.
  [ruby-dev:47804] [Bug #9109]
* vm_eval.c (rb_catch_obj): now th->tag points previous tag until
  TH_EXEC_TAG().


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43707 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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