Redo Vulkan command and descriptor pools. (#44496)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/44496
Test Plan: Imported from OSS
Reviewed By: IvanKobzarev
Differential Revision: D23820829
Pulled By: AshkanAliabadi
fbshipit-source-id: 3e114a3adcb2df01fb151c0536ce1a2e3f9dfbc1
