Commits on Jul 6, 2017

1. Introduce a new core pass called sys_core_alias …

   The goal of this pass is to find values that are built from
   patterns and generate aliases for those values to remove
   pressure from the GC. For example, this code:
   
      example({ok, Val}) ->
          {ok, Val}.
   
   shall become:
   
      example({ok, Val} = Tuple) ->
          Tuple.
   
   Currently this pass aliases tuple and cons nodes made of literals,
   variables and other cons. The tuple/cons may appear anywhere in the
   pattern and it will be aliased if used later on.
   
   Notice a tuple/cons made only of literals is not aliased as it may
   be part of the literal pool.

   José Valim committed Jul 6, 2017
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