Commits on Mar 28, 2015

1. Port of pcwalton removal of #[unsafe_destructor] check. …

   Earlier commits impose rules on lifetimes that make generic
   destructors safe; thus we no longer need the `#[unsafe_destructor]`
   attribute nor its associated check.
   
   ----
   
   So remove the check for the unsafe_destructor attribute.
   
   And remove outdated compile-fail tests from when lifetime-parameteric
   dtors were disallowed/unsafe.
   
   In addition, when one uses the attribute without the associated
   feature, report that the attribute is deprecated.
   
   However, I do not think this is a breaking-change, because the
   attribute and feature are still currently accepted by the compiler.
   (After the next snapshot that has this commit, we can remove the
   feature itself and the attribute as well.)
   
   ----
   
   I consider this to:
   
   Fix rust-lang#22196
   
   (techincally there is still the post snapshot work of removing the
   last remants of the feature and the attribute, but the ticket can
   still be closed in my opinion).

   

   pnkfelix committed Mar 28, 2015
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