[static runtime] Add _out variants and reuse memory (#44128)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/44128
Test Plan: Imported from OSS
Reviewed By: hlu1
Differential Revision: D23604304
Pulled By: bwasti
fbshipit-source-id: 06a23cb75700a0fc733069071843b7b498e7b9e9
