[swift-evolution] Generic Alaises

[James Campbell]

This was inspired from the topic about moving where clauses out of
parameter lists.

Certain generics get very long winded, I was wondering if we could create
some sort of alias for generics.

func anyCommonElements <T: SequenceType, U: SequenceType where
T.Generator.Element: Equatable, T.Generator.Element == U.Generator.Element>
(lhs: T, _ rhs: U) -> Bool

could be shared across functions like so:

genericalias SequencesWithSameElements<T, U> =  <T: SequenceType, U:
SequenceType where T.Generator.Element: Equatable, T.Generator.Element ==
U.Generator.Element>

func anyCommonElements <SequencesWithSameElements> (lhs: T, _ rhs: U) ->
Bool
func == <SequencesWithSameElements> (lhs: T, _ rhs: U) -> Bool

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