swift

d8b5b3dc - Swift SIL: Fix argument conventions for functions which have both, a direct and indirect result.

Swift SIL: Fix argument conventions for functions which have both, a direct and indirect result. The function convention for the first argument is not identified as indirect-out. This lets alias analysis assume that the memory pointed to by argument 0 cannot be written by the called function. The problem is that subscripting a LazyFilterCollection (with the base index, e.g. `Int`) does not work as expected, because it returns the nth element of the base collection! The fix is to implement the subscript "manually". Fixes a mis-compile. rdar://152160748