[Serializer] Unify usage of normalizer cache#10457

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Berdir wants to merge 3 commits intosymfony:masterfrom

Berdir:serializer-optimization

Commits on Mar 15, 2014

Move normalizer cache to getNormalier()/getDenormalizer(), use those in normalizeObject()/denormalizeObject()
Berdir
committed
Remove exception from getNormaler()/getDenormalizer(), documentation improvements
Berdir
committed
Remove wrong null assignment
Berdir
committed