Adding common interface implemented by Map and Vector that is mutable and iterable#7586

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acrylic-origami wants to merge 4 commits intofacebook:masterfrom acrylic-origami:master

Commits on Jan 7, 2017

Added MutableKeyedContainer as a union interface of KeyedContainer and IndexAccess for mutable, key-iterable collections (Map and Vector at the moment).
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committed

Commits on Jan 9, 2017

Modified corresponding system file for compatibility of MutableKeyedContainer with HHVM.
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committed

Commits on Sep 15, 2018