[roll] Roll fuchsia [kernel][vm] Re-design clone flags Changes the flag to CreateCloneLocked to be the kind of snapshot semantics that must be provided, instead of directly requesting a clone type. This allows for better logic inside CreateCloneLocked where instead of 'upgrading' the clone type, it can just pick a clone type that matches the request. The logic of picking the clone type is refactored to be in terms of finding the intersection of what kinds of clones are possible given the properties of the current VMO, and what semantics need to be provided. A consequence of this change is that it is now difficult to enforce a previous check that prevented SNAPSHOT_MODIFIED on a root with pinned pages, even though a SNAPSHOT_AT_LEAST_ON_WRITE would be permitted. The previous check was, however, a byproduct of the previous code structure and does not need to be enforced. Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1196435 Original-Revision: 1dab957bb1775a7e1904bb9012c59c71d19b49d7 GitOrigin-RevId: 917f9bf402d4d13bfe18de57edce34417af69f91 Change-Id: I7b62d6e28547d5885dee208a61049ccd898d19ac
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