Optimize Vulkan command buffer submission rate. (#49112)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/49112
Differential Revision: D25729889
Test Plan: Imported from OSS
Reviewed By: SS-JIA
Pulled By: AshkanAliabadi
fbshipit-source-id: c4ab470fdcf3f83745971986f3a44a3dff69287f
