[JIT] Fix shape analysis for aten::masked_select. (#40753)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/40753
The reference says that this op always returns a 1-D tensor, even if
the input and the mask are 0-D.
Test Plan: Imported from OSS
Reviewed By: eellison
Differential Revision: D22300354
Pulled By: ZolotukhinM
fbshipit-source-id: f6952989c8facf87d73d00505bf6d41573eff2d6
Author
Mikhail Zolotukhin
