backport slice assign large tensor fix #19032

[Zha0q1]

backports #19032

local run:

ubuntu@ip-172-31-38-169:~/myspace$ pytest tests/nightly/test_large_array.py::test_slice_assign
============================================= test session starts ==============================================
platform linux -- Python 3.7.7, pytest-5.4.1, py-1.8.1, pluggy-0.13.1
rootdir: /home/ubuntu/myspace
plugins: remotedata-0.3.2, openfiles-0.4.0, astropy-header-0.1.2, hypothesis-5.8.3, arraydiff-0.3, doctestplus-0.5.0
collected 1 item                                                                                               

tests/nightly/test_large_array.py .                                                                      [100%]

=============================================== warnings summary ===============================================
/home/ubuntu/anaconda3/lib/python3.7/site-packages/nose/importer.py:12
  /home/ubuntu/anaconda3/lib/python3.7/site-packages/nose/importer.py:12: DeprecationWarning: the imp module is deprecated in favour of importlib; see the module's documentation for alternative uses
    from imp import find_module, load_module, acquire_lock, release_lock

-- Docs: https://docs.pytest.org/en/latest/warnings.html
========================================= 1 passed, 1 warning in 2.21s ==================================

[mxnet-bot]

Hey @Zha0q1 , Thanks for submitting the PR
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[Zha0q1]

@szha