Merge #868

868: Add support for Wildcard pattern binding r=philberty a=philberty

Wildcard bindings allow us to bind expression to be unused such as:

  let _ = 123;

They are more commonly used in destructuring of tuples such as:

  let my_tuple = (1,2);
  let (a,_) = my_tuple;

This is the initial basic support for the basic form of let _ = ...; and
it also allows us to ignore parameters within functions as well.

Fixes #557


Co-authored-by: Philip Herron <philip.herron@embecosm.com>

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