An uninitialized function Result of a managed type needs special handling.
    When passing it as a var parameter a warning need to be emitted, since a user
    may expect Result to be empty (nil) by default as it happens with local vars
    of a managed type. But this is not true for Result and may lead to serious issues.

    The only exception is SetLength(Result, ?) for a string Result. A user always
    expects undefined contents of the string after calling SetLength(). In such
    case a hint need to be emitted.
+ Tests for this.

git-svn-id: trunk@40216 -