Change Substs to type alias for Slice<Kind> for interning#37100

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bors merged 3 commits intorust-lang:masterfrom

anp:master

Oct 15, 2016

Commits on Oct 6, 2016

Fixing comment typo.
anp
committed

Commits on Oct 12, 2016

Using a type alias of Slice<Kind<'tcx>> to intern Substs<'tcx>.
anp
committed

Commits on Oct 13, 2016

Adding FIXME for noop Substs::params.
anp
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