[snapshot] Reduce startup snapshot checksum check overhead
Avoid calculating the checksum on every snapshot deserialization. - Desktop: by default only in release - Android: once per process Most snapshot corruptions happen on android devices but there we also have the highest overhead from calculating the checksum. Findings doc: https://docs.google.com/document/d/e/2PACX-1vQWdJjrZpTL5VjbP_LHH-qQj-9vcmuLez93WPZhoacJT2bTXfCAdJpbexfJWP9jrAI5ek_416uZE6_W/pub Bug: v8:12195 Change-Id: Ic7f2f45a9e8ade31c3774a7b659d9c30769e2b44 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3583983Reviewed-by:Jakob Linke <jgruber@chromium.org> Commit-Queue: Camillo Bruni <cbruni@chromium.org> Cr-Commit-Position: refs/heads/main@{#80260}
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