Bug 810718 (part 1) - Enforce pldhash RECURSION_LEVEL checks in all builds and abort on failure.  r=bsmedberg.

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extra : rebase_source : 4233dc104d8db99ec19b5b4885a9ddfaa7287427
Bug 810718 (part 2) - Use a uint16_t for PLDHashTable::entrySize.

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extra : rebase_source : 342927bded18e5fa5289608e711cf343cecdcfcc