Commits on Apr 4, 2018

1. Fix another circulare deps link args issue …

   It turns out that the support in rust-lang#49316 wasn't enough to handle all cases
   notably the example in rust-lang#48661. The underlying bug was connected to panic=abort
   where lang items were listed in the `missing_lang_items` sets but didn't
   actually exist anywhere.
   
   This caused the linker backend to deduce that start-group/end-group wasn't
   needed because not all items were defined. Instead the missing lang items that
   don't actually need to have a definition are filtered out and not considered for
   the start-group/end-group arguments
   
   Closes rust-lang#48661

   

   alexcrichton committed Apr 4, 2018
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