Commits
Arnold Schwaighofer committed 541e0bfa61d
Fix optimizeUnconditionalCheckedCastInst It is not safe to dyn_cast the result to a SILInstrucion. Users of this function expect a nullptr return to mean no change has happened. If the operand was an argument this cast would fail although we have removed the cast instruction and changed the function. rdar://20991580 Swift SVN r28684