Projection: project_box is an address projection

Author: eeckstein

include/swift/SIL/Projection.h

@@ -348,6 +348,7 @@ class NewProjection {
       return false;
     case ValueKind::StructElementAddrInst:
     case ValueKind::RefElementAddrInst:
+    case ValueKind::ProjectBoxInst:
     case ValueKind::TupleElementAddrInst:
     case ValueKind::UncheckedTakeEnumDataAddrInst:
       return true;