Bug 1057928 (part 1) - In SpanningCellSorter, use |ops| instead of |entryCount| to indicate table liveness. r=dbaron.

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extra : rebase_source : 36efff6619b4ffe88ba4f4ddad58b3cddf805541
Bug 1057928 (part 2) - In nsTHashtable, use |ops| instead of |entrySize| to indicate table liveness. r=dbaron.

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extra : rebase_source : eca0eb98fe01fe6fc1a6a36de9b04bab5c71781d