Ruby

merge revision(s) 43748,45947,45951: [Backport #9739]

    * eval_intern.h (SAVE_ROOT_JMPBUF): workaround for the failure of
      test/ruby/test_exception.rb on Windows.
      wrap by __try and __exception statements on mswin to raise SIGSEGV
      when EXCEPTION_STACK_OVERFLOW is occurred, because MSVCRT doesn't
      handle the exception.
      however, (1) mingw-gcc doesn't support __try and __exception
      statements, and (2) we cannot retry SystemStackError after this
      change yet (maybe crashed) because SEH and longjmp() are too
      uncongenial.

    * signal.c (check_stack_overflow, CHECK_STACK_OVERFLOW): now defined on
      Windows, too.

    * thread_win32.c (ruby_stack_overflowed_p): ditto.

    * thread_win32.c (rb_w32_stack_overflow_handler): use Structured
      Exception Handling by Addvectoredexceptionhandler() for machine
      stack overflow on mingw.
      This would be equivalent to the handling using __try and __exept
      on mswin introduced by r43748.
      Exception Handling by AddVectoredExceptionHandler() for machine
      This would be equivalent to the handling using __try and __except

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@46576 b2dd03c8-39d4-4d8f-98ff-823fe69b080e