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Enum layout optimizations#19536

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luqmana wants to merge 11 commits intorust-lang:masterrust-lang/rust:masterfrom

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Commits on Dec 8, 2014

• librustc: Traverse arbitrarily deep for nullable enum opt.

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  3d7a446

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• librustc: Try looking in tuple fields for nullable enum opt.

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• librustc: Try looking in fixed sized arrays for nullable enum opt.

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  39be76e

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• Add tests.

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• librustc: Add NonZero lang item and use it if possible for nullable pointer enum opt.

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• libcore: Add NonZero lang item and implement some methods.

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• libcollections: Use NonZero in Vec.

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• liballoc: Use NonZero in Rc.

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• liballoc: Use NonZero in Arc.

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• libcore: Make it unsafe to create NonZero and impl Deref.

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• Add tests for NonZero.

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