Support concat new tokens mask and previous token mask for enumerated shape CoreML

[derekxu]

Differential Revision: D89554380

[pytorch-bot]

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❌ 1 New Failure, 1 Unrelated Failure

As of commit f063926 with merge base b8916b7 ():

NEW FAILURE - The following job has failed:

• pull / unittest-arm-backend-with-no-fvp (test_pytest_models) / linux-job (gh)
  RuntimeError: Command docker exec -t 8417d20c9c98fa651f32e72a981db216c8ef5d2b5d4ba671a73a9f126751809f /exec failed with exit code 1

UNSTABLE - The following job is marked as unstable, possibly due to flakiness on trunk:

• pull / android / run-emulator (gh) (#16137)
  Timeout waiting for emulator to boot.

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[meta-codesync]

@derekxu has exported this pull request. If you are a Meta employee, you can view the originating Diff in D89554380.

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