Make lazy tensor creation and value strings customizable (#76472)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/76472
- lets XLA backend customize codegenned functions during
migration to LTC
Test Plan: Imported from OSS
Reviewed By: Krovatkin, bdhirsh
Differential Revision: D35980435
Pulled By: wconstab
fbshipit-source-id: 6138aef20862fccec40d715ffbb5a40a0a7d0401
(cherry picked from commit bad23f4b7ef73ffc2ef4a893364512907e9c4555)
