[ET-VK][EZ] Print number of Vulkan subgraphs

[jorgep31415]

Stack from ghstack (oldest at bottom):

• -> #3624

• 3622

• 3621

For easy verification. Generally, we want this to say 1 subgraph to reduce CPU <-> GPU transitions.

Differential Revision: D57362841

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/3624

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:white_check_mark: No Failures

As of commit 82f762aa231d4e7c7f99d689516f0222784677d6 with merge base 8ddf836c2db7a6ed4c645fb246be5e495cc45d97 (): :green_heart: Looks good so far! There are no failures yet. :green_heart:

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[pytorch-bot[bot]]

Warning: Unknown label ciflow/periodic. Currently recognized labels are

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This pull request was exported from Phabricator. Differential Revision: D57362841

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D57362841

[facebook-github-bot]

This pull request has been merged in pytorch/executorch@245434e7fe7e69fdddffb54dc95e76b90ad7515d.