Fix overly strict assertion in SummarizeOldestCommittedSxact(). There's a
race condition where SummarizeOldestCommittedSxact() is called even though another backend already cleared out all finished sxact entries. That's OK, RegisterSerializableTransactionInt() can just retry getting a news xact slot from the available-list when that happens. Reported by YAMAMOTO Takashi, bug #5918.
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