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merge revision(s) r44535,r44536: [Backport #9321]

    * vm.c (rb_vm_pop_cfunc_frame): added.  It cares c_return event.
      The patch base by drkaes (Stefan Kaes).
      [Bug #9321]

    * variable.c (rb_mod_const_missing): use rb_vm_pop_cfunc_frame()
      instead of rb_frame_pop().

    * vm_eval.c (raise_method_missing): ditto.

    * vm_eval.c (rb_iterate): ditto.

    * internal.h (rb_vm_pop_cfunc_frame): add decl.

    * test/ruby/test_settracefunc.rb: add tests.
      provided by drkaes (Stefan Kaes).

    * vm.c, eval.c, include/ruby/intern.h (rb_frame_pop):
      move definition of rb_frame_pop() and deprecate it.
      It doesn't care about `return' events.

    * vm.c, eval.c, include/ruby/intern.h (rb_frame_pop):

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@46608 b2dd03c8-39d4-4d8f-98ff-823fe69b080e