Commits
Joe Groff committed e7f7df30272
Implement 'x is T' in SILGen. Add an IsaInst to represent type tests, and implement SILGen for IsSubtypeExpr AST nodes. Get rid of SuperIsArchetypeExpr because it's not really necessary to have it different from IsaSubtype--the SIL and IR behavior is identical. Swift SVN r4855