Turn off scalar_check for masked_select. (#29923)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/29923
Note that this changes the behavior of masked_select when both "self" and "mask" are 0-dimensional.
In previous versions of PyTorch, this would return a 0-dimensional tensor. But the documentation reads:
"Returns a new 1-D tensor which indexes the input tensor according to the boolean mask mask which is a BoolTensor."
Test Plan: Imported from OSS
Differential Revision: D18539560
Pulled By: gchanan
fbshipit-source-id: 1637ed2c434fcf8ceead0073aa610581f4a19d21
