Add Parsing of tensor constants (#75119)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/75119
Add support for parsing Tensor constants like Double(4, 4) ... by initializing random tensors. This makes saving IR and then parsing it lossy, so I have it toggled as default not on, but is useful in cases like repro-ing Fusions with tensor constants post-freezing.
cc Krovatkin
Test Plan: Imported from OSS
Reviewed By: ejguan
Differential Revision: D35373999
Pulled By: eellison
fbshipit-source-id: a5c8d9f93f23a7442258fc745ed6b6def330dca8
(cherry picked from commit 32dd6567522973563bd452bf486ed27b02e4e35c)
