[Erik-Lundell]

Exir: Defer string materialization in internal_assert

Make sure the string is only materialized when the
assert triggers. On one measurement, this sped up
memory planning validation of tiny_stories from 2.949 → 0.921 s.

Signed-off-by: Erik Lundell <erik.lundell@arm.com>

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218 @mansnils @Sebastian-Larsson @robell @rascani

[pytorch-bot]

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❌ 1 New Failure, 1 Pending, 1 Unrelated Failure

As of commit e6387e9 with merge base 0fde0dd ():

NEW FAILURE - The following job has failed:

• pull / test-models-linux (emformer_transcribe, portable, mt-l-x86iavx512-8-64) / linux-job (gh)
  RuntimeError: Command bash /__w/_temp/exec_script failed with exit code 1

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Test Vulkan Backend (specialized runners) / test-model-vulkan-e2e / linux-job (gh) (trunk failure)
  RuntimeError: Command bash /__w/_temp/exec_script failed with exit code 1

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[zingo]

Ok to merge, just make sure CI is OK, I see a lit of errors so I rebased this to make sure it not related and still there.