Use `int64_t` instead of `tensorflow::int64`
Use `int64_t` instead of `tensorflow::int64`

I realized `tensorflow::int64` is removed in 0b6b491d21d6a4eb5fbab1cca565bc1e94ca9543, but the line I modified didn't change, leading to a compile error when building custom ops:

/tmp/pip-build-env-9xgnct5m/normal/lib/python3.7/site-packages/tensorflow/include/tensorflow/core/framework/tensor_shape.h:305:22: warning: ‘tensorflow::int64’ is deprecated: Use int64_t instead. [-Wdeprecated-declarations]
       gtl::InlinedVector<int64, 4> dim_sizes() const;
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