Improve `alloc::Layout` coverage #175507

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3 errors and 10 warnings

The operation was canceled.

Canceling since a higher priority waiting request for CI-refs/pull/146452/merge exists

Directory or file /usr/local/.ghcup does not exist, skipping.

Directory or file /usr/local/bin/stack does not exist, skipping.

Directory or file /usr/local/bin/bicep does not exist, skipping.

Directory or file /usr/share/miniconda does not exist, skipping.

Directory or file /usr/share/gradle-* does not exist, skipping.

Directory or file /usr/local/share/edge_driver does not exist, skipping.

Directory or file /usr/local/share/chromium does not exist, skipping.

Directory or file /usr/local/share/chromedriver-* does not exist, skipping.

Directory or file /usr/local/lib/android does not exist, skipping.

Directory or file /usr/local/julia* does not exist, skipping.