Ruby » Ruby master

merge revision(s) 46465,46469,46484: [Backport #9961]

    * vm.c (rb_vm_rewind_cfp): add new function to rewind specified cfp
      with invoking RUBY_EVENT_C_RETURN.
      [Bug #9961]

    * vm_core.h: ditto.

    * eval.c (rb_protect): use it.

    * eval.c (rb_rescue2): ditto.

    * vm_eval.c (rb_iterate): ditto.

    * test/ruby/test_settracefunc.rb: add a test.

    * vm_core.h (rb_name_err_mesg_new):

    * vm_eval.c (rb_catch_protect): fix same problem of [Bug #9961].

    * vm_eval.c (rb_iterate): ditto.

    * vm_core.h (rb_vm_rewind_cfp): add the prototype declaration.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@47342 b2dd03c8-39d4-4d8f-98ff-823fe69b080e