Commit 6d776dfe authored by Protobuf Team Bot's avatar Protobuf Team Bot Committed by Copybara-Service
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protobuf: fix a data race in AbstractProtobufList 

Unconditional update of isMutable causes data races for
LazyStringArrayList::EMPTY_LIST that is used as the default value
for protobuf fields.

Not writing to it unconditionally may also improve performance
by reducing contention for the presumably widely shared EMPTY_LIST object.

PiperOrigin-RevId: 510366298
parent d41deb9d
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