swift234

ArraySemantics: Add support for the upcoming array.props semantic calls

"array.props.isCocoa/needsElementTypeCheck" semantic calls will mark calls that
return array properties: isCocoa and needsElementTypeCheck. We know that said
states can only transfer in certain directions (a native swift array that does
not need an element type check stays in this state) enabling us to version loops
based on the state of said array array properties.

rdar://17955309

Swift SVN r23688