Reland "[roheap] Check that ro-heap is always passed the same read-only snapshot"
This is a reland of a5fa211f des_checksum and call_once_run were undefined and unused respectively when shared read-only heap was enabled. Fixed with a copious amounts of USE. Original change's description: > [roheap] Check that ro-heap is always passed the same read-only snapshot > > Previously the ReadOnlyHeap simply discarded all but the first > ReadOnlyDeseralizer. ClearSharedHeapForTest should be called if using a > new ReadOnlyDeserializer (this might change in the future). > > Remove an obsolete 'StartupSerializerRootMapDependencies' test. It used > to test Map::WeakCellForMap which doesn't exist anymore and was > difficult to adapt to a shared read-only heap. > > Bug: v8:7464 > Change-Id: I64b8e953b0e3466e003541ec8a9321e439a01d33 > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1660612 > Reviewed-by: Yang Guo <yangguo@chromium.org> > Reviewed-by: Dan Elphick <delphick@chromium.org> > Commit-Queue: Maciej Goszczycki <goszczycki@google.com> > Cr-Commit-Position: refs/heads/master@{#62250} TBR: yangguo@chromium.org Bug: v8:7464 Change-Id: Id66e781be890c5ed03d066f8c62de703d5cb435e Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1667415Reviewed-by: Dan Elphick <delphick@chromium.org> Commit-Queue: Dan Elphick <delphick@chromium.org> Cr-Commit-Position: refs/heads/master@{#62302}
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