Commits on Apr 4, 2018

1. Use NonNull in the allocator API …

   As discussed in rust-lang#32838 (comment)
   and following, instead of *mut pointers, use NonNull for the allocator
   API.
   
   One issue is that older rustc versions, used to bootstrap the compiler,
   expands #[global_allocator], used in various places including libstd or
   librustc_[almt]san, to code that uses the Alloc trait, so changes to
   that trait make bootstrapping fail. Thankfully, it does so through the
   location of the Alloc trait before 94d1970
   so we can use at our advantage by making stage0 expose the old API as
   alloc::heap::Alloc.
   
   At the same time, we change the expansion for #[global_allocator] to use
   the new trait location under core, which will allow newer versions of
   rustc to bootstrap stage0 as well, despite the workaround described above.

   

   glandium committed Apr 4, 2018
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